chore: Add agents config for testing agents without docker-compose (#45)

## Summary

Add configuration support for testing agents without requiring
docker-compose setup. This enables easier local development and testing
workflows.

## Changes

- Added browser agent configuration to infer config
- Enables testing agents directly without docker-compose dependencies
- Improves developer experience for local testing

## Testing

The configuration has been tested locally and allows running agents
directly with the Inference Gateway CLI.

Signed-off-by: Eden Reich <eden.reich@gmail.com>

Author: edenreich

.infer/agents.yaml

@@ -0,0 +1,5 @@
+agents:
+  - name: browser-agent
+    url: http://localhost:8081
+    oci: ghcr.io/inference-gateway/browser-agent:latest
+    run: true