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/pages/home/home_page.dart

@@ -384,7 +384,18 @@ class _HomePageState extends ConsumerState<HomePage>
     ) => (label: label, visual: visual);
 
     final module = switch (agent) {
-      ActiveAgent.health => fromModule('记数据', AppModuleVisuals.health),
+      ActiveAgent.health => (
+        label: '记数据',
+        visual: AppModuleVisual(
+          module: AppModule.health,
+          label: AppModuleVisuals.health.label,
+          icon: AppModuleVisuals.healthOverviewIcon,
+          color: AppModuleVisuals.health.color,
+          lightColor: AppModuleVisuals.health.lightColor,
+          borderColor: AppModuleVisuals.health.borderColor,
+          gradient: AppModuleVisuals.health.gradient,
+        ),
+      ),
       ActiveAgent.diet => fromModule('拍饮食', AppModuleVisuals.diet),
       ActiveAgent.medication => fromModule('药管家', AppModuleVisuals.medication),
       ActiveAgent.report => fromModule('报告', AppModuleVisuals.report),
@@ -427,9 +438,9 @@ class _HomePageState extends ConsumerState<HomePage>
       child: Column(
         mainAxisSize: MainAxisSize.min,
         children: [
-          const SizedBox(height: 8),
+          const SizedBox(height: 4),
           _buildAgentBar(),
-          const SizedBox(height: 12),
+          const SizedBox(height: 5),
           if (_pickedImagePath != null) _buildImagePreview(),
           _buildInputBar(),
         ],
@@ -479,13 +490,13 @@ class _HomePageState extends ConsumerState<HomePage>
       chatProvider.select((state) => state.isStreaming),
     );
     return Padding(
-      padding: const EdgeInsets.fromLTRB(12, 0, 12, 10),
+      padding: const EdgeInsets.fromLTRB(12, 0, 12, 6),
       child: Container(
         padding: EdgeInsets.fromLTRB(
           6,
-          elderMode ? 7 : 5,
+          elderMode ? 5 : 3,
           6,
-          elderMode ? 7 : 5,
+          elderMode ? 5 : 3,
         ),
         decoration: BoxDecoration(
           color: Colors.white,
@@ -529,7 +540,7 @@ class _HomePageState extends ConsumerState<HomePage>
               isDense: true,
               contentPadding: EdgeInsets.symmetric(
                 horizontal: 4,
-                vertical: elderMode ? 15 : 12,
+                vertical: elderMode ? 12 : 9,
               ),
               border: InputBorder.none,
               enabledBorder: InputBorder.none,
@@ -960,7 +971,7 @@ class _VoiceHoldSurface extends StatelessWidget {
     return Container(
       padding: EdgeInsets.symmetric(
         horizontal: 4,
-        vertical: elderMode ? 14 : 11,
+        vertical: elderMode ? 12 : 9,
       ),
       alignment: Alignment.center,
       child: Text(