Add per-provider custom API URL configuration in AI Providers UI

flutter_app/lib/screens/provider_detail_screen.dart

@@ -8,12 +8,14 @@ class ProviderDetailScreen extends StatefulWidget {
   final AiProvider provider;
   final String? existingApiKey;
   final String? existingModel;
+  final String? existingBaseUrl;
 
   const ProviderDetailScreen({
     super.key,
     required this.provider,
     this.existingApiKey,
     this.existingModel,
+    this.existingBaseUrl,
   });
 
   @override
@@ -24,6 +26,7 @@ class _ProviderDetailScreenState extends State<ProviderDetailScreen> {
   static const _customModelSentinel = '__custom__';
 
   late final TextEditingController _apiKeyController;
+  late final TextEditingController _baseUrlController;
   late final TextEditingController _customModelController;
   late String _selectedModel;
   bool _isCustomModel = false;
@@ -41,6 +44,9 @@ class _ProviderDetailScreenState extends State<ProviderDetailScreen> {
   void initState() {
     super.initState();
     _apiKeyController = TextEditingController(text: widget.existingApiKey ?? '');
+    _baseUrlController = TextEditingController(
+      text: widget.existingBaseUrl ?? widget.provider.baseUrl,
+    );
     _customModelController = TextEditingController();
 
     final existing = widget.existingModel ?? widget.provider.defaultModels.first;
@@ -57,6 +63,7 @@ class _ProviderDetailScreenState extends State<ProviderDetailScreen> {
   @override
   void dispose() {
     _apiKeyController.dispose();
+    _baseUrlController.dispose();
     _customModelController.dispose();
     super.dispose();
   }
@@ -69,6 +76,13 @@ class _ProviderDetailScreenState extends State<ProviderDetailScreen> {
       );
       return;
     }
+    final baseUrl = _baseUrlController.text.trim();
+    if (baseUrl.isEmpty) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('API URL cannot be empty')),
+      );
+      return;
+    }
     final model = _effectiveModel;
     if (model.isEmpty) {
       ScaffoldMessenger.of(context).showSnackBar(
@@ -82,6 +96,7 @@ class _ProviderDetailScreenState extends State<ProviderDetailScreen> {
       await ProviderConfigService.saveProviderConfig(
         provider: widget.provider,
         apiKey: apiKey,
+        baseUrl: baseUrl,
         model: model,
       );
       if (mounted) {
@@ -214,6 +229,20 @@ class _ProviderDetailScreenState extends State<ProviderDetailScreen> {
           ),
           const SizedBox(height: 24),
 
+          // API URL
+          Text(
+            'API URL',
+            style: theme.textTheme.titleSmall?.copyWith(fontWeight: FontWeight.w600),
+          ),
+          const SizedBox(height: 8),
+          TextField(
+            controller: _baseUrlController,
+            decoration: const InputDecoration(
+              hintText: 'https://api.example.com/v1',
+            ),
+          ),
+          const SizedBox(height: 24),
+
           // Model selection
           Text(
             'Model',

flutter_app/lib/screens/providers_screen.dart

@@ -41,7 +41,8 @@ class _ProvidersScreenState extends State<ProvidersScreen> {
         builder: (_) => ProviderDetailScreen(
           provider: provider,
           existingApiKey: providerConfig?['apiKey'] as String?,
-          existingModel: _activeModel,
+          existingBaseUrl: providerConfig?['baseUrl'] as String?,
+          existingModel: providerConfig?['model'] as String? ?? _activeModel,
         ),
       ),
     );

flutter_app/lib/services/provider_config_service.dart

@@ -11,9 +11,20 @@ class ProviderConfigService {
     return "'${s.replaceAll("'", "'\\''")}'";
   }
 
+  static String? _extractPrimaryModel(dynamic modelsRaw) {
+    if (modelsRaw is! List || modelsRaw.isEmpty) return null;
+    final first = modelsRaw.first;
+    if (first is String) return first;
+    if (first is Map) {
+      final id = first['id'];
+      if (id is String && id.isNotEmpty) return id;
+    }
+    return null;
+  }
+
   /// Read the current config and return a map with:
   /// - `activeModel`: the current primary model string (or null)
-  /// - `providers`: Map<providerId, {apiKey, model}> for configured providers
+  /// - `providers`: Map<providerId, {apiKey, baseUrl, model, ...}> for configured providers
   static Future<Map<String, dynamic>> readConfig() async {
     try {
       final content = await NativeBridge.readRootfsFile(_configPath);
@@ -42,7 +53,14 @@ class ProviderConfigService {
         final providerEntries = modelsSection['providers'] as Map<String, dynamic>?;
         if (providerEntries != null) {
           for (final entry in providerEntries.entries) {
-            providers[entry.key] = entry.value;
+            if (entry.value is Map) {
+              final normalized = Map<String, dynamic>.from(entry.value as Map);
+              final model = _extractPrimaryModel(normalized['models']);
+              if (model != null) {
+                normalized['model'] = model;
+              }
+              providers[entry.key] = normalized;
+            }
           }
         }
       }
@@ -53,17 +71,18 @@ class ProviderConfigService {
     }
   }
 
-  /// Save a provider's API key and set its model as the active model.
+  /// Save a provider's API key/base URL and set its model as the active model.
   /// Tries a Node.js one-liner in proot first, then falls back to a direct
   /// file write via NativeBridge.writeRootfsFile if proot/DNS is unavailable.
   static Future<void> saveProviderConfig({
     required AiProvider provider,
     required String apiKey,
+    required String baseUrl,
     required String model,
   }) async {
     final providerIdJson = jsonEncode(provider.id);
     final apiKeyJson = jsonEncode(apiKey);
-    final baseUrlJson = jsonEncode(provider.baseUrl);
+    final baseUrlJson = jsonEncode(baseUrl);
     final modelJson = jsonEncode(model);
 
     // Build the provider object with the model as an object containing `id`,
@@ -100,7 +119,7 @@ fs.writeFileSync(p, JSON.stringify(c, null, 2));
       await _saveConfigDirect(
         providerId: provider.id,
         apiKey: apiKey,
-        baseUrl: provider.baseUrl,
+        baseUrl: baseUrl,
         model: model,
       );
     }