Add tags to the generated openapi spec.

[anekkanti]

Note

Annotates CloudService RPCs with OpenAPI metadata (tags, summaries, docs) and updates grpc-gateway/buf deps; also adjusts the audit log sink validate route.

• OpenAPI/Swagger annotations:
  • Add protoc-gen-openapiv2 annotations import and top-level openapiv2_swagger metadata (title, description, version, external docs, tags) in service.proto.
  • Annotate nearly all CloudService RPCs with openapiv2_operation (tags, summaries, descriptions, external docs; mark GetUsage as deprecated).
  • Change HTTP route for ValidateAccountAuditLogSink from /cloud/audit-log-sink/validate to /cloud/audit-log-sink-validate.
• Build/config:
  • Upgrade protoc-gen-openapiv2 to v2.26.3 in Makefile; add grpc-gateway dep v2.26.3 in buf.yaml; refresh buf.lock.
  • Update buf.gen.yaml to include disable_service_tags=true for openapiv2 plugin.

^{Written by Cursor Bugbot for commit a46c05e. This will update automatically on new commits. Configure here.}