AI配置化

lib/providers/ai_provider.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../api/ai_api.dart';
 import '../core/network/api_exception.dart';
 import '../models/ai.dart';
+import 'ai_config_provider.dart';
 import 'bill_refresh.dart';
 import 'note_provider.dart';
 
@@ -157,9 +158,11 @@ class AssistantNotifier extends Notifier<AssistantState> {
     // 这次对话动过哪些数据
     final mutated = <_Mutated>{};
     try {
+      // 带上用户选中的配置。null = 用服务端 .env 那套（虚拟的「默认」项）
+      final configId = ref.read(selectedAiConfigProvider);
       await for (final event in ref
           .read(aiApiProvider)
-          .chat(sessionId: state.sessionId, content: trimmed)) {
+          .chat(sessionId: state.sessionId, configId: configId, content: trimmed)) {
         if (!ref.mounted) return;
 
         switch (event.type) {