The Docker build was failing because protobuf-generated code wasn't
available during compilation. Changes made:
- Added protoc and protobuf-dev packages to build dependencies
- Installed protoc-gen-go and protoc-gen-go-grpc plugins
- Added make proto-gen step to generate pb files before build
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
igodwin