feat: UI全面改造 + 后端多项修复

【后端修复】
- 删除diet/consultation agent假工具声明
- 修复DayOfWeek实体注释
- 修复Vision API content序列化
- cleanup_service级联删除修复
- 用药提醒时区偏差修复
- 统一DateTime处理(UtcNow+8)
- 新增UTC DateTime JSON转换器

【前端UI重构】
- 配色体系全面更新(#8B5CF6淡紫+#F0ECFF背景)
- 登录页重设计
- 首页重设计(透明顶栏、渐变背景、胶囊输入区)
- 聊天卡片加白蓝边框、渐变标题
- 侧边栏重构(渐变背景、合并顶部、删除底部设置)
- 确认卡片可编辑字段恢复
- 所有子页面加返回按钮
- catch异常加日志
- 删除后refresh provider缓存

health_app/lib/providers/auth_provider.dart

@@ -84,7 +84,9 @@ class AuthNotifier extends Notifier<AuthState> {
           ),
         );
       }
-    } catch (_) {}
+    } catch (e) {
+      print('[Auth]加载个人信息失败: $e');
+    }
   }
 
   /// 发送验证码，返回 (error, devCode)
@@ -131,7 +133,7 @@ class AuthNotifier extends Notifier<AuthState> {
     final db = ref.read(localDbProvider);
     final refresh = await db.read('refresh_token');
     if (refresh != null) {
-      try { await api.post('/api/auth/logout', data: {'refreshToken': refresh}); } catch (_) {}
+      try { await api.post('/api/auth/logout', data: {'refreshToken': refresh}); } catch (e) { print('[Auth]登出请求失败: $e'); }
     }
     await api.clearTokens();
     state = const AuthState(isLoggedIn: false, isLoading: false);

health_app/lib/providers/chat_provider.dart

@@ -82,6 +82,31 @@ class ChatNotifier extends Notifier<ChatState> {
 
   void markNeedsRebuild() => state = state.copyWith();
 
+  /// 不可变消息操作方法（供 chat_messages_view 新版代码调用）
+  void confirmMessage(String id) {
+    final msgs = state.messages.toList();
+    final i = msgs.indexWhere((m) => m.id == id);
+    if (i >= 0) { msgs[i].confirmed = true; state = state.copyWith(messages: msgs); }
+    ref.invalidate(medicationListProvider);
+    ref.invalidate(latestHealthProvider);
+  }
+
+  void startEditingField(String msgId, String fieldLabel) {
+    final msgs = state.messages.toList();
+    final i = msgs.indexWhere((m) => m.id == msgId);
+    if (i >= 0) { msgs[i].metadata?['_editingField'] = fieldLabel; state = state.copyWith(messages: msgs); }
+  }
+
+  void finishEditingField(String msgId, String fieldLabel, String value) {
+    final msgs = state.messages.toList();
+    final i = msgs.indexWhere((m) => m.id == msgId);
+    if (i >= 0) {
+      if (value.isNotEmpty) msgs[i].metadata?[fieldLabel] = value;
+      msgs[i].metadata?.remove('_editingField');
+      state = state.copyWith(messages: msgs);
+    }
+  }
+
   @override
   ChatState build() {
     Future.microtask(() {

health_app/lib/providers/consultation_provider.dart

@@ -197,7 +197,7 @@ class ConsultationChatNotifier extends Notifier<ConsultationChatState> {
         doctorTitle: doc['title']?.toString() ?? '',
         doctorDepartment: doc['department']?.toString() ?? '',
       );
-    } catch (_) {}
+    } catch (e) { print('[Consultation]请求失败: $e'); }
   }
 
   Future<void> _loadMessages(String consultationId) async {
@@ -218,7 +218,7 @@ class ConsultationChatNotifier extends Notifier<ConsultationChatState> {
       if (msgs.isNotEmpty) {
         state = state.copyWith(messages: msgs);
       }
-    } catch (_) {}
+    } catch (e) { print('[Consultation]请求失败: $e'); }
   }
 
   Future<void> sendMessage(String text) async {
@@ -333,7 +333,7 @@ class ConsultationChatNotifier extends Notifier<ConsultationChatState> {
       if (newMsgs.isNotEmpty) {
         state = state.copyWith(messages: [...state.messages, ...newMsgs]);
       }
-    } catch (_) {}
+    } catch (e) { print('[Consultation]请求失败: $e'); }
   }
 
   void stop() {