* feat: add gRPC proxy support
* fix: respect channelOptions grpc.primary_user_agent over User-Agent header
* fix: remove non-standard grpc_proxy/no_grpc_proxy env var support
These are not recognized by any standard gRPC implementation. gRPC proxy
now uses the standard http_proxy/https_proxy/no_proxy variables like
grpc-core, grpc-go, and grpc-java.
* chore: add resolveGrpcProxyConfig tests and clean up grpc-client
Export resolveGrpcProxyConfig for testability and add unit tests covering
all proxy modes (off, on, system), auth encoding, protocol rejection,
bypass lists, and edge cases. Remove redundant cancelAndCloseConnection
call in startConnection (already guarded by addConnection). Document why
internal @grpc/grpc-js channel options are used for programmatic proxy.
* feat: add user-agent support in gRPC client channel options
- Extracted user-agent from request headers and set it as grpc.primary_user_agent channel option.
- Updated client instantiation to merge user-agent with existing channel options for enhanced request handling.
* test: add unit tests for GrpcClient user-agent handling
* test: enhance GrpcClient user-agent tests with edge case handling
* test: enhance GrpcClient channelOptions handling with override capability
* fix: grpc import paths
* refactor: extract protobuf include directory logic into a separate function
* rm: comment
* fix: improve filtering of enabled import paths in protobuf configuration
* refactor: streamline import path handling in protobuf configuration
rm: comment
fix: type generation
feat: implement reflection client support for gRPC v1 and v1alpha in grpc-client
refactor: simplify reflection client handling in grpc-client by removing service list retrieval
refactor: enhance reflection client return structure in grpc-client to include service list
fix: lint
