feat: 添加 Docker 支持与项目文档

- 添加 Dockerfile, docker-compose.yml, .dockerignore, nginx 配置
- 添加后端 API 设计文档、平台架构需求文档、系统开发计划
- 添加 PostgreSQL schema 设计
- 更新 README.md 和 design-qa.md

docker-compose.yml

@@ -0,0 +1,15 @@
+services:
+  yg-ft-frontend:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: yg-ft-frontend:latest
+    container_name: yg-ft-frontend
+    ports:
+      - "6801:80"
+    environment:
+      # Change this if the backend is deployed somewhere else.
+      API_PROXY_PASS: "http://host.docker.internal:7861"
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+    restart: unless-stopped