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refactor(proto): remove gRPC, gateway, and openapiv2 code generation

Remove grpc/go, grpc-ecosystem/gateway, and grpc-ecosystem/openapiv2
plugins from buf.gen.yaml since the gRPC server has been removed.

- Delete generated *_grpc.pb.go and *.pb.gw.go stubs
- Delete generated apidocs.swagger.yaml
- Remove grpc-gateway managed disable (no longer needed)

Only protobuf messages, validate, and connectrpc plugins remain.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>