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

backend/src/Health.WebApi/appsettings.json

@@ -0,0 +1,24 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*",
+  "ConnectionStrings": {
+    "Default": "Host=localhost;Database=health_manager;Username=postgres;Password=postgres123"
+  },
+  "JWT_SECRET": "dev-secret-key-change-in-production-min-32-chars!!",
+  "JWT_ISSUER": "health-manager",
+  "JWT_AUDIENCE": "health-manager-app",
+  "DEEPSEEK_BASE_URL": "https://api.deepseek.com/v1",
+  "DEEPSEEK_API_KEY": "sk-your-key-here",
+  "DEEPSEEK_MODEL": "deepseek-chat",
+  "QWEN_BASE_URL": "https://dashscope.aliyuncs.com/compatible-mode/v1",
+  "QWEN_API_KEY": "sk-your-key-here",
+  "QWEN_VISION_MODEL": "qwen-vl-max",
+  "MINIO_ENDPOINT": "localhost:9000",
+  "MINIO_ACCESS_KEY": "minioadmin",
+  "MINIO_SECRET_KEY": "minioadmin123"
+}