feat: add WebSocket server with full NIP-01 support

WebSocket handler:
- NIP-01 protocol (EVENT, REQ, CLOSE, OK, EOSE, NOTICE)
- JSON envelope parsing
- Shares subscription manager with gRPC (unified event fan-out)
- Standard Nostr client compatibility

Relay now serves dual protocols:
- gRPC on :50051 (binary, high performance)
- WebSocket on :8080 (JSON, Nostr standard)

Both protocols share:
- Same storage layer
- Same subscription manager
- Same validation logic

Compatible with all Nostr clients!

1 files changed, 4 insertions, 0 deletions

diff --git a/internal/handler/grpc/server.go b/internal/handler/grpc/server.go
index 74857f6..b65b527 100644
--- a/internal/handler/grpc/server.go
+++ b/internal/handler/grpc/server.go
@@ -28,6 +28,10 @@ func NewServer(store EventStore) *Server {
         }
 }
 
+func (s *Server) SetSubscriptionManager(mgr *subscription.Manager) {
+        s.subs = mgr
+}
+
 func (s *Server) PublishEvent(ctx context.Context, req *pb.PublishEventRequest) (*pb.PublishEventResponse, error) {
         if req.Event == nil {
                 return &pb.PublishEventResponse{