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/health_drawer.dart

@@ -10,6 +10,7 @@ import '../providers/auth_provider.dart';
 import '../providers/chat_provider.dart';
 import '../providers/conversation_history_provider.dart';
 import 'app_toast.dart';
+import 'authenticated_network_image.dart';
 import '../providers/data_providers.dart';
 import 'drawer_shell.dart';
 
@@ -136,9 +137,7 @@ class _AccountHeader extends StatelessWidget {
             width: 66,
             height: 66,
             decoration: BoxDecoration(
-              color: Colors.white,
               shape: BoxShape.circle,
-              border: Border.all(color: Colors.white, width: 2),
               boxShadow: [
                 BoxShadow(
                   color: const Color(0xFF7C5CFF).withValues(alpha: 0.16),
@@ -147,10 +146,33 @@ class _AccountHeader extends StatelessWidget {
                 ),
               ],
             ),
-            child: const Icon(
-              Icons.person_rounded,
-              color: Color(0xFF94A3B8),
-              size: 34,
+            child: Stack(
+              fit: StackFit.expand,
+              children: [
+                ClipOval(
+                  clipBehavior: Clip.antiAlias,
+                  child: ColoredBox(
+                    color: const Color(0xFFF1F5F9),
+                    child: user?.avatarUrl?.toString().isNotEmpty == true
+                        ? AuthenticatedNetworkImage(
+                            imageUrl: user.avatarUrl.toString(),
+                            fit: BoxFit.cover,
+                            width: 66,
+                            height: 66,
+                            errorBuilder: (_, _, _) => const Icon(
+                              Icons.person_rounded,
+                              color: Color(0xFF94A3B8),
+                              size: 34,
+                            ),
+                          )
+                        : const Icon(
+                            Icons.person_rounded,
+                            color: Color(0xFF94A3B8),
+                            size: 34,
+                          ),
+                  ),
+                ),
+              ],
             ),
           ),
         ),
@@ -208,11 +230,6 @@ class _HealthDashboard extends StatelessWidget {
   Widget build(BuildContext context) {
     return _Panel(
       title: '健康仪表盘',
-      trailing: _TextAction(
-        label: '详情',
-        light: true,
-        onTap: () => pushRoute(ref, 'trend'),
-      ),
       titleColor: Colors.white,
       backgroundPainter: const _HealthDashboardBackgroundPainter(),
       child: latestHealth.when(
@@ -313,7 +330,7 @@ class _MetricTile extends StatelessWidget {
       onTap: onTap,
       borderRadius: BorderRadius.circular(18),
       child: Container(
-        height: elderMode ? 112 : 100,
+        height: elderMode ? 108 : 100,
         padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 10),
         decoration: BoxDecoration(
           color: Colors.white.withValues(alpha: 0.22),
@@ -627,13 +644,11 @@ class _LightSection extends StatelessWidget {
 class _Panel extends StatelessWidget {
   final String title;
   final Widget child;
-  final Widget? trailing;
   final CustomPainter? backgroundPainter;
   final Color titleColor;
   const _Panel({
     required this.title,
     required this.child,
-    this.trailing,
     this.backgroundPainter,
     this.titleColor = AppColors.textPrimary,
   });
@@ -664,20 +679,13 @@ class _Panel extends StatelessWidget {
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.start,
             children: [
-              Row(
-                children: [
-                  Expanded(
-                    child: Text(
-                      title,
-                      style: TextStyle(
-                        fontSize: 18,
-                        fontWeight: FontWeight.w600,
-                        color: titleColor,
-                      ),
-                    ),
-                  ),
-                  ?trailing,
-                ],
+              Text(
+                title,
+                style: TextStyle(
+                  fontSize: 18,
+                  fontWeight: FontWeight.w600,
+                  color: titleColor,
+                ),
               ),
               const SizedBox(height: 12),
               child,
@@ -708,45 +716,6 @@ class _HealthDashboardBackgroundPainter extends CustomPainter {
   bool shouldRepaint(_HealthDashboardBackgroundPainter oldDelegate) => false;
 }
 
-class _TextAction extends StatelessWidget {
-  final String label;
-  final VoidCallback onTap;
-  final bool light;
-  const _TextAction({
-    required this.label,
-    required this.onTap,
-    this.light = false,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    return InkWell(
-      onTap: onTap,
-      borderRadius: BorderRadius.circular(999),
-      child: Container(
-        padding: const EdgeInsets.symmetric(horizontal: 11, vertical: 6),
-        decoration: BoxDecoration(
-          color: light
-              ? Colors.white.withValues(alpha: 0.24)
-              : const Color(0xFFEDE9FE),
-          borderRadius: BorderRadius.circular(999),
-          border: light
-              ? Border.all(color: Colors.white.withValues(alpha: 0.34))
-              : null,
-        ),
-        child: Text(
-          label,
-          style: TextStyle(
-            fontSize: 12,
-            fontWeight: FontWeight.w700,
-            color: light ? Colors.white : Color(0xFF6D28D9),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
 class _IconButton extends StatelessWidget {
   final IconData icon;
   final VoidCallback onTap;