feat: 完成龙虾记忆同步系统

后端:
- Django + DRF
- PostgreSQL 数据库
- 文件扫描服务
- 差异检查服务
- 完整 REST API

前端:
- React + Ant Design
- 文件树展示
- 差异对比
- API 客户端封装

部署:
- Docker Compose
- 后端 Dockerfile
- 前端 Dockerfile
- 一键启动脚本

功能:
- 扫描龙虾记忆文件
- 检查文件差异
- 双向同步（本地 <-> 数据库）
- 版本历史
- 统计信息

backend/manage.py

@@ -0,0 +1,23 @@
+# Django manage.py
+#!/usr/bin/env python
+"""Django's command-line utility for administrative tasks."""
+import os
+import sys
+
+
+def main():
+    """Run administrative tasks."""
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'memory_sync.settings')
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == '__main__':
+    main()