port agent and LLM services to Go, update go.mod and go.sum(agent): port agent and LLM services to Go, update go.mod and go.sum

[wisenewbie]

Ported agent and LLM services from Python to Go.
Updated go.mod and go.sum to include new dependencies.
Details
Rewrote the agent and LLM service logic in Go for improved performance and native Linux support.
Ensured all endpoints and features from the Python version are present in the Go implementation.
Updated module dependencies to reflect new Go code.
All changes are backward compatible with the existing deployment and monitoring stack.
Testing
Local build and run successful.
All endpoints tested and responding as expected.
Monitoring and health checks verified.
Next Steps
Migrate remaining Python services (if any) to Go.
Expand test coverage for new Go code.