完善跨平台回放与实时状态更新

DEPLOYMENT.md

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+# Deployment
+
+All runtime paths are resolved relative to the repository by default and can be overridden with environment variables.
+
+- `LS_DATABASE_URL`: SQLAlchemy database URL.
+- `LS_REPLAY_MEDIA_DIR`: server-local directory containing replay files.
+
+## Linux and macOS
+
+Run `./start.sh`. The script resolves its own directory and does not depend on `/workspace`.
+
+## Windows
+
+1. Create a virtual environment with `py -m venv backend\.venv`.
+2. Install dependencies with `backend\.venv\Scripts\pip install -r backend\requirements.txt`.
+3. Optionally set `LS_REPLAY_MEDIA_DIR` to an absolute media directory.
+4. Run `powershell -ExecutionPolicy Bypass -File .\start.ps1`.
+5. In another terminal, run `npm install` and `npm run dev` from `frontend`.
+
+Replay records store paths relative to `LS_REPLAY_MEDIA_DIR`. Absolute paths and parent-directory traversal are rejected.