Add web interface and Docker deployment

Expose the paste tool through a lightweight web UI/API and provide the container setup required for the publicpaste service.

README.md

@@ -52,6 +52,43 @@ Useful options:
 
 Failures print a concise error to stderr and exit with status `1`.
 
+## Web service
+
+`publicpaste` also includes a zero-dependency web UI and JSON API:
+
+```sh
+python -m publicpaste.web
+# or, after installation:
+publicpaste-web
+```
+
+Open `http://127.0.0.1:12072`, enter text, and click “完成”. The page calls `POST /api/paste`, shows the returned URL/provider, and copies the URL to the clipboard.
+
+Useful environment variables:
+
+- `PUBLICPASTE_HOST`: bind host, default `0.0.0.0`
+- `PUBLICPASTE_PORT`: bind port, default `12072`
+- `PUBLICPASTE_DATA_DIR`: data/log directory, default `/data`
+- `PUBLICPASTE_TIMEOUT`: per-provider timeout, default `8.0`
+- `PUBLICPASTE_OVERALL_TIMEOUT`: total wait budget, default `12.0`
+- `PUBLICPASTE_VERIFY`: verify returned URL when true, default false
+
+Health check:
+
+```sh
+curl http://127.0.0.1:12072/health
+```
+
+## Docker
+
+Build and run with Compose:
+
+```sh
+docker compose up -d --build
+```
+
+The included `compose.yml` uses image/container name `publicpaste`, maps `12072:12072`, and stores logs/data in `/vol1/1000/docker/publicpaste/data` mounted at `/data`.
+
 ## Python API
 
 ```python