feat: bundle provider auth plugins

Co-authored-by: ItzR3NO <ItzR3NO@users.noreply.github.com>

extensions/copilot-proxy/README.md

@@ -0,0 +1,24 @@
+# Copilot Proxy (Clawdbot plugin)
+
+Provider plugin for the **Copilot Proxy** VS Code extension.
+
+## Enable
+
+Bundled plugins are disabled by default. Enable this one:
+
+```bash
+clawdbot plugins enable copilot-proxy
+```
+
+Restart the Gateway after enabling.
+
+## Authenticate
+
+```bash
+clawdbot models auth login --provider copilot-proxy --set-default
+```
+
+## Notes
+
+- Copilot Proxy must be running in VS Code.
+- Base URL must include `/v1`.