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

.gitignore

@@ -0,0 +1,37 @@
+# Secrets
+.env
+*.pem
+*.key
+*.pfx
+
+# .NET build outputs
+backend/**/bin/
+backend/**/obj/
+
+# Flutter build outputs
+health_app/build/
+health_app/.dart_tool/
+health_app/.flutter-plugins*
+health_app/.packages
+
+# Android
+health_app/android/.gradle/
+health_app/android/app/build/
+health_app/android/local.properties
+
+# iOS
+health_app/ios/Pods/
+health_app/ios/.symlinks/
+
+# IDE
+.idea/
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+.vs/
+.vscode/
+
+# OS
+.DS_Store
+Thumbs.db