refactor(json)!: remove Gson compatibility methods and consolidate JSON processing

- The codebase has fully migrated to using Jackson for all JSON parsing and serialization.
- All methods and utilities providing backward compatibility for Gson `JsonObject`
- and `JsonArray` have been removed.
- This includes Gson-specific update methods in entities, builder methods, storage
- methods, and utility conversion functions.
- This change simplifies the codebase, reduces dependency surface, and improves
- performance by removing unnecessary conversions.

BREAKING CHANGE: All Gson-specific compatibility methods and utilities
 have been removed. Code relying on these methods will need to be updated
 to use Jackson directly.

Author: RealSeek

src/main/java/snw/kookbc/impl/entity/CustomEmojiImpl.java

@@ -85,13 +85,6 @@ public void setName0(String name) {
         this.name = name;
     }
 
-    // GSON compatibility method
-    public synchronized void update(com.google.gson.JsonObject data) {
-        update(snw.kookbc.util.JacksonUtil.convertFromGsonJsonObject(data));
-    }
-
-    // ===== Jackson API - 高性能版本 =====
-
     @Override
     public synchronized void update(JsonNode data) {
         isTrue(Objects.equals(getId(), getRequiredString(data, "id")), "You can't update the emoji by using different data");

src/main/java/snw/kookbc/impl/entity/GameImpl.java

@@ -98,13 +98,6 @@ public void setNameAndIcon(@NotNull String name, @NotNull String icon) {
         this.icon = icon;
     }
 
-    // GSON compatibility method
-    public synchronized void update(com.google.gson.JsonObject data) {
-        update(snw.kookbc.util.JacksonUtil.convertFromGsonJsonObject(data));
-    }
-
-    // ===== Jackson API - 高性能版本 =====
-
     @Override
     public synchronized void update(JsonNode data) {
         this.name = getStringOrDefault(data, "name", "Unknown Game");

src/main/java/snw/kookbc/impl/entity/GuildImpl.java

@@ -251,7 +251,7 @@ public Role createRole(String s) {
                 .put("name", s)
                 .build();
         JsonNode res = client.getNetworkClient().post(HttpAPIRoute.ROLE_CREATE.toFullURL(), body);
-        Role result = client.getEntityBuilder().buildRole(this, snw.kookbc.util.JacksonUtil.convertToGsonJsonObject(res));
+        Role result = client.getEntityBuilder().buildRole(this, res);
         client.getStorage().addRole(this, result);
         return result;
     }
@@ -365,11 +365,6 @@ public void setAvatar(String avatarUrl) {
         this.avatarUrl = avatarUrl;
     }
 
-    // GSON compatibility method - marked for deprecation
-    public synchronized void updateFromGson(com.google.gson.JsonObject data) {
-        update(snw.kookbc.util.JacksonUtil.convertFromGsonJsonObject(data));
-    }
-
     @Override
     public synchronized void update(JsonNode data) {
         final String id = data.get("id").asText();

src/main/java/snw/kookbc/impl/entity/RoleImpl.java

@@ -166,13 +166,6 @@ public void setMentionable0(boolean mentionable) {
         this.mentionable = mentionable;
     }
 
-    // GSON compatibility method
-    public synchronized void update(com.google.gson.JsonObject data) {
-        update(snw.kookbc.util.JacksonUtil.convertFromGsonJsonObject(data));
-    }
-
-    // ===== Jackson API - 高性能版本 =====
-
     @Override
     public synchronized void update(JsonNode data) {
         isTrue(getId() == getRequiredInt(data, "role_id"), "You can't update the role by using different data");

src/main/java/snw/kookbc/impl/entity/UserImpl.java

@@ -344,12 +344,6 @@ public void setVipAvatarUrl(String vipAvatarUrl) {
         this.vipAvatarUrl = vipAvatarUrl;
     }
 
-    // GSON compatibility method
-    public void update(com.google.gson.JsonObject data) {
-        // 性能优化：使用 convertFromGsonJsonObject 避免 toString() 序列化开销
-        update(snw.kookbc.util.JacksonUtil.convertFromGsonJsonObject(data));
-    }
-
     @Override
     public synchronized void update(JsonNode data) {
         Validate.isTrue(Objects.equals(getId(), data.get("id").asText()),

src/main/java/snw/kookbc/impl/entity/builder/CardBuilder.java

@@ -84,30 +84,6 @@ public static Object buildCard(String jsonString) {
         }
     }
 
-    // ===== Gson兼容方法（向后兼容）=====
-
-    /**
-     * 从Gson JsonArray构建多卡片组件（向后兼容）
-     * @param array Gson JsonArray
-     * @return MultipleCardComponent
-     */
-    public static MultipleCardComponent buildCard(com.google.gson.JsonArray array) {
-        // 转换Gson JsonArray到Jackson JsonNode
-        JsonNode arrayNode = JacksonCardUtil.parse(array.toString());
-        return buildCardArray(arrayNode);
-    }
-
-    /**
-     * 从Gson JsonObject构建单个卡片组件（向后兼容）
-     * @param object Gson JsonObject
-     * @return CardComponent
-     */
-    public static CardComponent buildCard(com.google.gson.JsonObject object) {
-        // 转换Gson JsonObject到Jackson JsonNode
-        JsonNode objectNode = JacksonCardUtil.parse(object.toString());
-        return buildCardObject(objectNode);
-    }
-
     // ===== 序列化方法 =====
 
     /**
@@ -128,37 +104,4 @@ public static JsonNode serializeToNode(MultipleCardComponent component) {
         return JacksonCardUtil.toJsonNode(component);
     }
 
-    /**
-     * 序列化单个卡片组件为Gson JsonArray（向后兼容）
-     * @param component CardComponent
-     * @return JsonArray
-     */
-    public static com.google.gson.JsonArray serialize(CardComponent component) {
-        com.google.gson.JsonArray result = new com.google.gson.JsonArray();
-        result.add(serialize0(component));
-        return result;
-    }
-
-    /**
-     * 序列化多卡片组件为Gson JsonArray（向后兼容）
-     * @param component MultipleCardComponent
-     * @return JsonArray
-     */
-    public static com.google.gson.JsonArray serialize(MultipleCardComponent component) {
-        com.google.gson.JsonArray array = new com.google.gson.JsonArray();
-        for (CardComponent card : component.getComponents()) {
-            array.add(serialize0(card));
-        }
-        return array;
-    }
-
-    /**
-     * 序列化单个卡片组件为Gson JsonObject（向后兼容）
-     * @param component CardComponent
-     * @return JsonObject
-     */
-    public static com.google.gson.JsonObject serialize0(CardComponent component) {
-        String json = JacksonCardUtil.toJson(component);
-        return new com.google.gson.JsonParser().parse(json).getAsJsonObject();
-    }
 }

src/main/java/snw/kookbc/impl/entity/builder/EntityBuildUtil.java

@@ -39,58 +39,6 @@
 
 public class EntityBuildUtil {
 
-    // ===== Gson兼容方法（向后兼容）=====
-
-    public static Collection<Channel.RolePermissionOverwrite> parseRPO(com.google.gson.JsonObject object) {
-        com.google.gson.JsonArray array = object.getAsJsonArray("permission_overwrites");
-        Collection<Channel.RolePermissionOverwrite> rpo = new ConcurrentLinkedQueue<>();
-        for (com.google.gson.JsonElement element : array) {
-            com.google.gson.JsonObject orpo = element.getAsJsonObject();
-            rpo.add(
-                    new Channel.RolePermissionOverwrite(
-                            orpo.get("role_id").getAsInt(),
-                            orpo.get("allow").getAsInt(),
-                            orpo.get("deny").getAsInt()));
-        }
-        return rpo;
-    }
-
-    public static Collection<Channel.UserPermissionOverwrite> parseUPO(KBCClient client, com.google.gson.JsonObject object) {
-        com.google.gson.JsonArray array = object.getAsJsonArray("permission_users");
-        Collection<Channel.UserPermissionOverwrite> upo = new ConcurrentLinkedQueue<>();
-        for (com.google.gson.JsonElement element : array) {
-            com.google.gson.JsonObject oupo = element.getAsJsonObject();
-            com.google.gson.JsonObject rawUser = oupo.getAsJsonObject("user");
-            upo.add(
-                    new Channel.UserPermissionOverwrite(
-                            client.getStorage().getUser(rawUser.get("id").getAsString(), rawUser),
-                            oupo.get("allow").getAsInt(),
-                            oupo.get("deny").getAsInt()));
-        }
-        return upo;
-    }
-
-    public static NotifyType parseNotifyType(com.google.gson.JsonObject object) {
-        Guild.NotifyType type = null;
-        int rawNotifyType = object.get("notify_type").getAsInt();
-        for (Guild.NotifyType value : Guild.NotifyType.values()) {
-            if (value.getValue() == rawNotifyType) {
-                type = value;
-                break;
-            }
-        }
-        notNull(type, String.format("Internal Error: Unexpected NotifyType from remote: %s", rawNotifyType));
-        return type;
-    }
-
-    public static Guild parseEmojiGuild(String id, KBCClient client, com.google.gson.JsonObject object) {
-        Guild guild = null;
-        if (id.contains("/")) {
-            guild = client.getStorage().getGuild(id.substring(0, id.indexOf("/")));
-        }
-        return guild;
-    }
-
     @Nullable
     public static Channel parseChannel(KBCClient client, String id, int type) {
         switch (type) {
@@ -147,10 +95,9 @@ public static Collection<Channel.UserPermissionOverwrite> parseUPO(KBCClient cli
                         int allow = snw.kookbc.util.JacksonUtil.getIntOrDefault(element, "allow", 0);
                         int deny = snw.kookbc.util.JacksonUtil.getIntOrDefault(element, "deny", 0);
 
-                        // 临时桥接到Gson JsonObject
-                        com.google.gson.JsonObject gsonUser = convertToGsonJsonObject(rawUser);
+                        // 直接使用Jackson JsonNode
                         upo.add(new Channel.UserPermissionOverwrite(
-                                client.getStorage().getUser(userId, gsonUser),
+                                client.getStorage().getUser(userId, rawUser),
                                 allow, deny));
                     }
                 }
@@ -189,9 +136,4 @@ public static Guild parseEmojiGuild(String id, KBCClient client, JsonNode node)
         return guild;
     }
 
-    // 临时桥接方法 - 将JsonNode转换为JsonObject供现有代码使用
-    private static com.google.gson.JsonObject convertToGsonJsonObject(JsonNode jacksonNode) {
-        return snw.kookbc.util.JacksonUtil.convertToGsonJsonObject(jacksonNode);
-    }
-
 }

src/main/java/snw/kookbc/impl/entity/builder/EntityBuilder.java

@@ -56,60 +56,6 @@ public EntityBuilder(KBCClient client) {
         this.client = client;
     }
 
-    /**
-     * 构建User对象 (Gson兼容版本)
-     * 该方法保留用于向后兼容，内部委托给Jackson版本
-     */
-    public User buildUser(com.google.gson.JsonObject s) {
-        JsonNode node = convertFromGsonJsonObject(s);
-        return buildUser(node);
-    }
-
-    /**
-     * 构建Guild对象 (Gson兼容版本)
-     * 该方法保留用于向后兼容，内部委托给Jackson版本
-     */
-    public Guild buildGuild(com.google.gson.JsonObject object) {
-        JsonNode node = convertFromGsonJsonObject(object);
-        return buildGuild(node);
-    }
-
-    /**
-     * 构建Channel对象 (Gson兼容版本)
-     * 该方法保留用于向后兼容，内部委托给Jackson版本
-     */
-    public Channel buildChannel(com.google.gson.JsonObject object) {
-        JsonNode node = convertFromGsonJsonObject(object);
-        return buildChannel(node);
-    }
-
-    /**
-     * 构建Role对象 (Gson兼容版本)
-     * 该方法保留用于向后兼容，内部委托给Jackson版本
-     */
-    public Role buildRole(Guild guild, com.google.gson.JsonObject object) {
-        JsonNode node = convertFromGsonJsonObject(object);
-        return buildRole(guild, node);
-    }
-
-    /**
-     * 构建CustomEmoji对象 (Gson兼容版本)
-     * 该方法保留用于向后兼容，内部委托给Jackson版本
-     */
-    public CustomEmoji buildEmoji(com.google.gson.JsonObject object) {
-        JsonNode node = convertFromGsonJsonObject(object);
-        return buildEmoji(node);
-    }
-
-    /**
-     * 构建Game对象 (Gson兼容版本)
-     * 该方法保留用于向后兼容，内部委托给Jackson版本
-     */
-    public Game buildGame(com.google.gson.JsonObject object) {
-        JsonNode node = convertFromGsonJsonObject(object);
-        return buildGame(node);
-    }
-
     // ===== Jackson API - 高性能版本（处理Kook不完整JSON数据）=====
 
     /**

src/main/java/snw/kookbc/impl/entity/builder/MessageBuilder.java

@@ -86,26 +86,6 @@ public static Object[] serialize(BaseComponent component) {
         throw new RuntimeException("Unsupported component");
     }
 
-    public PrivateMessage buildPrivateMessage(com.google.gson.JsonObject object) {
-        // 性能优化：使用 convertFromGsonJsonObject 避免 toString() 序列化开销
-        return buildPrivateMessage(JacksonUtil.convertFromGsonJsonObject(object));
-    }
-
-    public ChannelMessage buildChannelMessage(com.google.gson.JsonObject object) {
-        // 性能优化：使用 convertFromGsonJsonObject 避免 toString() 序列化开销
-        return buildChannelMessage(JacksonUtil.convertFromGsonJsonObject(object));
-    }
-
-    private User getAuthor(com.google.gson.JsonObject extra) {
-        // 性能优化：使用 convertFromGsonJsonObject 避免 toString() 序列化开销
-        return getAuthor(JacksonUtil.convertFromGsonJsonObject(extra));
-    }
-
-    private Message getQuote(com.google.gson.JsonObject extra) {
-        // 性能优化：使用 convertFromGsonJsonObject 避免 toString() 序列化开销
-        return getQuote(JacksonUtil.convertFromGsonJsonObject(extra));
-    }
-
     private ChannelMessageImpl buildMessage(String id, User author, BaseComponent component, long timeStamp,
             Message message, String targetId, int channelType) {
         if (channelType == CHANNEL_TYPE_TEXT) {
@@ -118,19 +98,6 @@ private ChannelMessageImpl buildMessage(String id, User author, BaseComponent co
         throw new RuntimeException("We can not found channel type: " + channelType);
     }
 
-    public Message buildQuote(com.google.gson.JsonObject object) {
-        if (object == null) {
-            return null;
-        }
-        // 性能优化：使用 convertFromGsonJsonObject 避免 toString() 序列化开销
-        return buildQuote(JacksonUtil.convertFromGsonJsonObject(object));
-    }
-
-    public BaseComponent buildComponent(com.google.gson.JsonObject object) {
-        // 性能优化：使用 convertFromGsonJsonObject 避免 toString() 序列化开销
-        return buildComponent(JacksonUtil.convertFromGsonJsonObject(object));
-    }
-
     // ===== Jackson API - 高性能版本 =====
 
     public PrivateMessage buildPrivateMessage(JsonNode node) {

src/main/java/snw/kookbc/impl/entity/channel/ChannelImpl.java

@@ -39,7 +39,6 @@
 import static snw.jkook.util.Validate.isTrue;
 import static snw.kookbc.impl.entity.builder.EntityBuildUtil.parseRPO;
 import static snw.kookbc.impl.entity.builder.EntityBuildUtil.parseUPO;
-import static snw.kookbc.util.JacksonUtil.convertFromGsonJsonObject;
 import static snw.kookbc.util.JacksonUtil.getAsInt;
 import static snw.kookbc.util.JacksonUtil.getAsString;
 
@@ -320,18 +319,13 @@ public User getMaster() {
         return master;
     }
 
-    // GSON compatibility method
-    public synchronized void update(com.google.gson.JsonObject data) {
-        update(convertFromGsonJsonObject(data));
-    }
-
     public synchronized void update(JsonNode data) {
         isTrue(Objects.equals(getId(), snw.kookbc.util.JacksonUtil.get(data, "id").asText()), "You can't update channel by using different data");
         this.name = snw.kookbc.util.JacksonUtil.get(data, "name").asText();
         this.permSync = snw.kookbc.util.JacksonUtil.get(data, "permission_sync").asInt() != 0;
         this.guild = client.getStorage().getGuild(snw.kookbc.util.JacksonUtil.get(data, "guild_id").asText());
-        this.rpo = parseRPO(snw.kookbc.util.JacksonUtil.convertToGsonJsonObject(data));
-        this.upo = parseUPO(client, snw.kookbc.util.JacksonUtil.convertToGsonJsonObject(data));
+        this.rpo = parseRPO(data);
+        this.upo = parseUPO(client, data);
 
         // Why we delay the add operation?
         // We may construct the channel object at any time,