feat: 问诊对话+建档引导+报告+日历+趋势页重写+视觉统一

- 问诊对话页: 新建consultation_provider, 完整AI分身聊天UI
- 首次建档引导: OnboardingPrompt+ManageArchiveTool+前端卡片
- 报告模块: POST端点 + report_agent_handler接VLM
- 健康日历: GET /api/calendar端点 + 前端接API
- 趋势页重写: 删除Mock数据 + 真实API + 手动录入
- 饮食保存: submit按钮接后端API
- 侧边栏: 健康概览横排 + 统一紫色配色
- 运动计划: 修复JSON反序列化(record→手动解析)
- VLM: prompt优化 + 模型切qwen3-vl-plus + 1280px压缩
- UI颜色: 加深主色 8B9CF7→6C5CE7
- 个人信息页精简 + 健康档案可编辑重设计
- 保洁: 删除无用agent_bar + 删除意见反馈/关于我们
- 新增AI提示词文档

health_app/lib/pages/home/widgets/chat_messages_view.dart

@@ -69,6 +69,8 @@ class ChatMessagesView extends ConsumerWidget {
         return _buildDietAnalysisCard(context, msg);
       case MessageType.reportAnalysis:
         return _buildReportAnalysisCard(context, msg);
+      case MessageType.onboarding:
+        return _buildOnboardingCard(context, ref);
       case MessageType.quickOptions:
         return _buildQuickOptionsCard(context, msg);
       default:
@@ -837,7 +839,65 @@ class ChatMessagesView extends ConsumerWidget {
   }
 
   // ═══════════════════════════════════════════════════════════
-  // 6. QuickOptionsCard — 优化样式
+  // 6. OnboardingCard — 首次建档引导
+  Widget _buildOnboardingCard(BuildContext context, WidgetRef ref) {
+    return Align(
+      alignment: Alignment.centerLeft,
+      child: Container(
+        margin: const EdgeInsets.only(bottom: 12),
+        constraints: BoxConstraints(maxWidth: MediaQuery.of(context).size.width * 0.88),
+        decoration: BoxDecoration(
+          color: Colors.white,
+          borderRadius: BorderRadius.circular(20),
+          boxShadow: [BoxShadow(color: const Color(0xFF8B9CF7).withAlpha(25), blurRadius: 14, offset: const Offset(0, 4))],
+        ),
+        clipBehavior: Clip.antiAlias,
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Container(
+              width: double.infinity,
+              padding: const EdgeInsets.fromLTRB(20, 24, 20, 16),
+              decoration: const BoxDecoration(
+                gradient: LinearGradient(colors: [Color(0xFF8B9CF7), Color(0xFFA78BFA)], begin: Alignment.topLeft, end: Alignment.bottomRight),
+              ),
+              child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+                Row(children: [
+                  Container(width: 48, height: 48, decoration: BoxDecoration(color: Colors.white.withAlpha(30), borderRadius: BorderRadius.circular(14)), child: const Icon(Icons.health_and_safety, size: 28, color: Colors.white)),
+                  const SizedBox(width: 14),
+                  const Text('欢迎来到健康管家！', style: TextStyle(fontSize: 18, fontWeight: FontWeight.w700, color: Colors.white)),
+                ]),
+                const SizedBox(height: 12),
+                Text('我是您的AI健康管家。为了给您更精准的建议，\n我先了解一些基本信息好吗？大约2-3分钟。',
+                    style: TextStyle(fontSize: 14, color: Colors.white.withAlpha(220), height: 1.5)),
+              ]),
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(18, 18, 18, 20),
+              child: Column(children: [
+                SizedBox(
+                  width: double.infinity,
+                  child: ElevatedButton(
+                    onPressed: () {
+                      ref.read(chatProvider.notifier).startOnboarding();
+                    },
+                    style: ElevatedButton.styleFrom(backgroundColor: const Color(0xFF8B9CF7), foregroundColor: Colors.white, shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)), padding: const EdgeInsets.symmetric(vertical: 14)),
+                    child: const Text('开始建档', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
+                  ),
+                ),
+                const SizedBox(height: 10),
+                TextButton(
+                    onPressed: () => ref.read(chatProvider.notifier).dismissOnboarding(),
+                    child: const Text('以后再说', style: TextStyle(fontSize: 14, color: Color(0xFF999999)))),
+              ]),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  // 7. QuickOptionsCard — 优化样式
   // ═══════════════════════════════════════════════════════════
 
   Widget _buildQuickOptionsCard(BuildContext context, ChatMessage msg) {