feat: 多项改进和bug修复

- 添加移动端onboarding引导页
- 添加DarkModeSvg组件支持SVG暗黑模式
- 修复AI配置页数据同步问题（useEffect依赖、activeEndpointId匹配）
- 添加密钥/密码输入框显示隐藏切换
- 修复driver.js引导卡片样式透明问题
- 修复设置页面EndpointEditor无限循环问题
- AI配置优先读取有API Key的endpoint
- 无模型时自动选择第一个可用模型
- 主题选择卡片与桌面端保持一致
- 更换外观页面插画为smiling_girl.svg

Author: codedogQBY

.expo/README.md

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+> Why do I have a folder named ".expo" in my project?
+
+The ".expo" folder is created when an Expo project is started using "expo start" command.
+
+> What do the files contain?
+
+- "devices.json": contains information about devices that have recently opened this project. This is used to populate the "Development sessions" list in your development builds.
+- "settings.json": contains the server configuration that is used to serve the application manifest.
+
+> Should I commit the ".expo" folder?
+
+No, you should not share the ".expo" folder. It does not contain any information that is relevant for other developers working on the project, it is specific to your machine.
+Upon project creation, the ".expo" folder is already added to your ".gitignore" file.

.expo/devices.json

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+{
+  "devices": []
+}