Initial commit: 健康管家 AI 健康陪伴助手

- Backend: .NET 10 Minimal API + EF Core + PostgreSQL
- Frontend: Flutter + Riverpod + GoRouter + Dio
- AI: DeepSeek LLM + Qwen VLM (OpenAI-compatible)
- Auth: SMS + JWT (access/refresh tokens)
- Features: AI chat, health tracking, medication management, diet analysis, exercise plans, doctor consultations, report analysis

health_app/lib/widgets/agent_bar.dart

@@ -0,0 +1,61 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import '../providers/chat_provider.dart';
+
+/// 智能体胶囊栏——横向滑动
+class AgentBar extends ConsumerWidget {
+  const AgentBar({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final selected = ref.watch(selectedAgentProvider);
+    final chatNotifier = ref.read(chatProvider.notifier);
+
+    void onTap(ActiveAgent agent) {
+      final notifier = ref.read(selectedAgentProvider.notifier);
+      notifier.select(agent == selected ? null : agent);
+      chatNotifier.setAgent(agent);
+    }
+
+    return Container(
+      height: 48,
+      color: Colors.white,
+      child: ListView(
+        scrollDirection: Axis.horizontal,
+        padding: const EdgeInsets.symmetric(horizontal: 12),
+        children: [
+          _buildCapsule('AI问诊', Icons.medical_services, ActiveAgent.consultation, selected, onTap),
+          _buildCapsule('记数据', Icons.edit_note, ActiveAgent.health, selected, onTap),
+          _buildCapsule('拍饮食', Icons.restaurant, ActiveAgent.diet, selected, onTap),
+          _buildCapsule('药管家', Icons.medication, ActiveAgent.medication, selected, onTap),
+          _buildCapsule('看报告', Icons.description, ActiveAgent.report, selected, onTap),
+          _buildCapsule('运动计划', Icons.fitness_center, ActiveAgent.exercise, selected, onTap),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildCapsule(String label, IconData icon, ActiveAgent agent, ActiveAgent? selected, void Function(ActiveAgent) onTap) {
+    final isSelected = selected == agent;
+    return GestureDetector(
+      onTap: () => onTap(agent),
+      child: Container(
+        margin: const EdgeInsets.symmetric(horizontal: 4, vertical: 6),
+        padding: const EdgeInsets.symmetric(horizontal: 14),
+        decoration: BoxDecoration(
+          color: isSelected ? const Color(0xFF635BFF) : Colors.white,
+          border: Border.all(color: const Color(0xFF635BFF)),
+          borderRadius: BorderRadius.circular(24),
+        ),
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Icon(icon, size: 16, color: isSelected ? Colors.white : const Color(0xFF635BFF)),
+            const SizedBox(width: 6),
+            Text(label, style: TextStyle(fontSize: 13, color: isSelected ? Colors.white : const Color(0xFF635BFF))),
+          ],
+        ),
+      ),
+    );
+  }
+}