docs: update README, TODO, and deployment docs

README: Added hierarchical routing, classifier bucket mapping, two-level
dispatch, model groups table, DeepSeek language note, deploy script, and
updated model names to match current models.dev registry.

TODO: Added 15 completed items covering model groups, routing, dispatch,
and provider fixes from May 7 session.

deployment.md: Added deploy.sh instructions.

deployment.md

@@ -26,6 +26,22 @@ go build -o gophergate ./cmd/gophergate
 ./gophergate
 ```
 
+### Quick Deploy Script
+
+A `deploy.sh` script is provided for production restarts:
+
+```bash
+./deploy.sh
+```
+
+This script will:
+1. Stop any running gophergate process
+2. Pull latest changes from git
+3. Build the application
+4. Start it in the background (logs to `gophergate.log`)
+
+If the build fails, the previous binary is left untouched and the script exits.
+
 ## Docker Deployment
 
 The project includes a multi-stage `Dockerfile` for minimal image size.
@@ -50,3 +66,4 @@ docker run -d \
 - **SSL/TLS:** It is recommended to run the proxy behind a reverse proxy like Nginx or Caddy for SSL termination.
 - **Backups:** Regularly backup the `data/llm_proxy.db` file.
 - **Monitoring:** Monitor the `/health` endpoint for system status.
+- **Logs:** When started with `deploy.sh` or `nohup`, logs are written to `gophergate.log`.