fix: VLM识别修复 + 饮食CRUD + 侧边栏美化 + UI优化

- VLM: ChatMessage.Content string→object, 修复视觉content双重序列化
- 饮食: diet/medication端点 record→手动JSON解析, 修复循环引用
- 饮食记录: 左滑删除 + 去评分 + AI饮食评语(DeepSeek)
- 侧边栏: 功能区统一Row+Expanded, 服务包compact模式
- 历史对话: 点击加载历史消息
- 登录页: 居中布局, 去底部空白
- UI: 主色加深#6C5CE7, maxWidth:1024防图片超大

health_app/lib/widgets/health_drawer.dart

@@ -119,51 +119,47 @@ class HealthDrawer extends ConsumerWidget {
 
             const SizedBox(height: 10),
 
-            // ════════════ 功能区（横向排布）════════════
+            // ════════════ 功能区（横向均布）════════════
             _SectionCard(
               color: Colors.white,
               gradientColors: null,
-              child: Padding(
-                padding: const EdgeInsets.fromLTRB(14, 12, 14, 14),
-                child: Column(
-                  crossAxisAlignment: CrossAxisAlignment.start,
-                  children: [
-                    Padding(
-                      padding: const EdgeInsets.only(bottom: 10),
-                      child: Row(children: [
-                        Container(
-                          padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
-                          decoration: BoxDecoration(
-                            color: const Color(0xFFF0A060).withAlpha(15),
-                            borderRadius: BorderRadius.circular(6),
-                          ),
-                          child: const Row(mainAxisSize: MainAxisSize.min, children: [
-                            Icon(Icons.apps_rounded, size: 13, color: Color(0xFFF0A060)),
-                            SizedBox(width: 4),
-                            Text('功能', style: TextStyle(fontSize: 12, fontWeight: FontWeight.w600, color: Color(0xFFF0A060))),
-                          ]),
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Padding(
+                    padding: const EdgeInsets.fromLTRB(16, 14, 16, 6),
+                    child: Row(children: [
+                      Container(
+                        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
+                        decoration: BoxDecoration(
+                          color: const Color(0xFFF0A060).withAlpha(15),
+                          borderRadius: BorderRadius.circular(6),
                         ),
-                      ]),
-                    ),
-                    Wrap(
-                      spacing: 8,
-                      runSpacing: 8,
-                      children: [
-                        _FeatureChip(icon: Icons.description_outlined, label: '报告管理', onTap: () => pushRoute(ref, 'reports')),
-                        _FeatureChip(icon: Icons.calendar_today_outlined, label: '健康日历', onTap: () => pushRoute(ref, 'calendar')),
-                        _FeatureChip(icon: Icons.restaurant_outlined, label: '饮食记录', onTap: () => pushRoute(ref, 'dietRecords')),
-                        _FeatureChip(icon: Icons.event_note_outlined, label: '复查随访', onTap: () => pushRoute(ref, 'followups')),
-                      ],
-                    ),
-                  ],
-                ),
+                        child: const Row(mainAxisSize: MainAxisSize.min, children: [
+                          Icon(Icons.apps_rounded, size: 13, color: Color(0xFFF0A060)),
+                          SizedBox(width: 4),
+                          Text('功能', style: TextStyle(fontSize: 12, fontWeight: FontWeight.w600, color: Color(0xFFF0A060))),
+                        ]),
+                      ),
+                    ]),
+                  ),
+                  Padding(
+                    padding: const EdgeInsets.fromLTRB(12, 4, 12, 14),
+                    child: Row(children: [
+                      _FeatureChip(icon: Icons.description_outlined, label: '报告管理', onTap: () => pushRoute(ref, 'reports')),
+                      _FeatureChip(icon: Icons.calendar_today_outlined, label: '健康日历', onTap: () => pushRoute(ref, 'calendar')),
+                      _FeatureChip(icon: Icons.restaurant_outlined, label: '饮食记录', onTap: () => pushRoute(ref, 'dietRecords')),
+                      _FeatureChip(icon: Icons.event_note_outlined, label: '复查随访', onTap: () => pushRoute(ref, 'followups')),
+                    ]),
+                  ),
+                ],
               ),
             ),
 
             const SizedBox(height: 10),
 
             // ════════════ 产品服务包 ════════════
-            const ServicePackageCard(),
+            const ServicePackageCard(compact: true),
 
             const SizedBox(height: 10),
 
@@ -196,7 +192,7 @@ class HealthDrawer extends ConsumerWidget {
                       ),
                     ]),
                   ),
-                  _buildConversationList(ref, conversations),
+                  _buildConversationList(context, ref, conversations),
                 ],
               ),
             ),
@@ -253,7 +249,7 @@ class HealthDrawer extends ConsumerWidget {
     return metric.toString();
   }
 
-  Widget _buildConversationList(WidgetRef ref, AsyncValue<List<ConversationItem>> conversations) {
+  Widget _buildConversationList(BuildContext context, WidgetRef ref, AsyncValue<List<ConversationItem>> conversations) {
     return conversations.when(
       data: (items) {
         if (items.isEmpty) {
@@ -268,7 +264,13 @@ class HealthDrawer extends ConsumerWidget {
           padding: const EdgeInsets.fromLTRB(8, 6, 8, 14),
           child: Column(
             mainAxisSize: MainAxisSize.min,
-            children: items.map((item) => _ConversationItem(item: item)).toList(),
+            children: items.map((item) => _ConversationItem(
+              item: item,
+              onTap: () {
+                ref.read(chatProvider.notifier).loadConversation(item.id);
+                Navigator.of(context).pop(); // 关闭抽屉
+              },
+            )).toList(),
           ),
         );
       },
@@ -394,22 +396,20 @@ class _FeatureChip extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Material(
-      color: Colors.transparent,
-      child: InkWell(
+    return Expanded(
+      child: GestureDetector(
         onTap: onTap,
-        borderRadius: BorderRadius.circular(12),
-        child: AnimatedContainer(
-          duration: const Duration(milliseconds: 200),
-          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
+        child: Container(
+          margin: const EdgeInsets.symmetric(horizontal: 3),
+          padding: const EdgeInsets.symmetric(vertical: 10),
           decoration: BoxDecoration(
             color: _c.withAlpha(10),
             borderRadius: BorderRadius.circular(12),
           ),
-          child: Row(mainAxisSize: MainAxisSize.min, children: [
-            Icon(icon, size: 17, color: _c),
-            const SizedBox(width: 6),
-            Text(label, style: const TextStyle(fontSize: 12, fontWeight: FontWeight.w500, color: _c)),
+          child: Column(mainAxisSize: MainAxisSize.min, children: [
+            Icon(icon, size: 18, color: _c),
+            const SizedBox(height: 6),
+            Text(label, style: const TextStyle(fontSize: 10, fontWeight: FontWeight.w500, color: Color(0xFF666666))),
           ]),
         ),
       ),
@@ -423,8 +423,9 @@ class _FeatureChip extends StatelessWidget {
 
 class _ConversationItem extends StatelessWidget {
   final ConversationItem item;
+  final VoidCallback? onTap;
 
-  const _ConversationItem({required this.item});
+  const _ConversationItem({required this.item, this.onTap});
 
   @override
   Widget build(BuildContext context) {
@@ -436,6 +437,7 @@ class _ConversationItem extends StatelessWidget {
         border: Border.all(color: const Color(0xFFEEEEEE)),
       ),
       child: ListTile(
+        onTap: onTap,
         contentPadding: const EdgeInsets.symmetric(horizontal: 10, vertical: 2),
         leading: Container(
           width: 32, height: 32,