docs: add Go Micro vs Dapr comparison

## Summary Publish an honest Go Micro vs Dapr comparison page focused on agents, services, workflows, and production deployment. ## Why Dapr has a strong distributed-application building-block and Dapr Agents narrative. Go Micro needs a clear comparison that explains when Go Micro is the better fit, when Dapr is the better fit, and when teams can use both. ## Acceptance criteria - Add a comparison doc under the website docs. - Cover services, tools, agents, workflows, state, pub/sub, deployment, observability, and interop. - Include a concise decision table. - Link the comparison from an appropriate docs index or roadmap/README location. - Keep claims conservative and verifiable. ## Verification - `make docs-wayfinding` or the closest relevant docs check. - `go test ./...` if code paths are touched.