feat: AI 意图路由/草稿存储 + Prompts 模块化 + UI 视觉统一 + AI 同意门 + 资源更新

后端:
- 新增 ai_intent_router 意图路由
- 新增 AiEntryDraft 草稿存储 + EF 迁移
- 新增 Prompts 模块化（global/modules/rag/router）
- AI Agent handlers 扩展

前端:
- 新增 AI 同意门 (ai_consent_gate/provider/details_page)
- HealthMetricVisuals 视觉统一
- 设备扫描/管理页面优化
- agent 插图替换 + 趋势指标图标

配置:
- DeepSeek 模型改 deepseek-v4-flash
- .gitignore 加 artifacts/audit
- build.gradle.kts 签名配置调整

health_app/lib/widgets/doctor_drawer.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../core/app_colors.dart';
+import '../core/app_module_visuals.dart';
 import '../core/navigation_provider.dart';
 import '../providers/auth_provider.dart';
 import '../pages/doctor/doctor_home_page.dart' show doctorPageProvider;
@@ -64,7 +65,7 @@ class DoctorDrawer extends ConsumerWidget {
                     ),
                   ),
                   _DrawerItem(
-                    icon: Icons.description_outlined,
+                    icon: AppModuleVisuals.report.icon,
                     label: '报告审核',
                     selected: currentPage == 'reports',
                     onTap: () => runAfterDrawerClose(
@@ -73,7 +74,7 @@ class DoctorDrawer extends ConsumerWidget {
                     ),
                   ),
                   _DrawerItem(
-                    icon: Icons.event_note_outlined,
+                    icon: AppModuleVisuals.followup.icon,
                     label: '复查随访',
                     selected: currentPage == 'followups',
                     onTap: () => runAfterDrawerClose(