完善文档与前端迁移，补充开源协议

docker-compose.mysql.yml

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+services:
+  mysql:
+    image: mysql:8.0
+    container_name: qquiz_mysql
+    environment:
+      MYSQL_ROOT_PASSWORD: root_password
+      MYSQL_DATABASE: qquiz_db
+      MYSQL_USER: qquiz
+      MYSQL_PASSWORD: qquiz_password
+    volumes:
+      - mysql_data:/var/lib/mysql
+    ports:
+      - "3306:3306"
+    command: --default-authentication-plugin=mysql_native_password --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "qquiz", "-pqquiz_password"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  backend:
+    environment:
+      - DATABASE_URL=mysql+aiomysql://qquiz:qquiz_password@mysql:3306/qquiz_db
+    depends_on:
+      mysql:
+        condition: service_healthy
+
+volumes:
+  mysql_data: