Models: add Qwen Portal OAuth support

extensions/qwen-portal-auth/README.md

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+# Qwen Portal OAuth (Clawdbot plugin)
+
+OAuth provider plugin for **Qwen Portal** (free-tier OAuth).
+
+## Enable
+
+Bundled plugins are disabled by default. Enable this one:
+
+```bash
+clawdbot plugins enable qwen-portal-auth
+```
+
+Restart the Gateway after enabling.
+
+## Authenticate
+
+```bash
+clawdbot models auth login --provider qwen-portal --set-default
+```
+
+## Notes
+
+- Qwen OAuth uses a device-code login flow.
+- Tokens expire periodically; re-run login if requests fail.