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, 20 insertions, 9 deletions

diff --git a/README.md b/README.md
index d0ff872..8fd35c5 100644
--- a/README.md
+++ b/README.md
@@ -24,10 +24,12 @@ make build-all      # Build both
 ```bash
 ./bin/relay
 # or with custom settings:
-./bin/relay -grpc-addr :50051 -db relay.db
+./bin/relay -grpc-addr :50051 -ws-addr :8080 -db relay.db
 ```
 
-The relay will start listening on `:50051` (gRPC).
+The relay will start:
+- **gRPC** on `:50051`
+- **WebSocket** (Nostr) on `:8080`
 
 ### Test with Client
 
@@ -44,18 +46,22 @@ The relay will start listening on `:50051` (gRPC).
 #   - abc123...: Hello from gRPC client!
 ```
 
-**With nak CLI:**
+**With nak CLI (gRPC):**
 ```bash
 # Pipe events from nak
 nak event "Hello from nak!" | ./bin/testclient
 
 # Or generate a signed event
 nak event --sec <nsec> --kind 1 "My message" | ./bin/testclient
+```
 
-# Output:
-# Read event from stdin: abc123...
-# Publishing event...
-# ✓ Event published successfully: abc123...
+**With nak CLI (WebSocket/Nostr):**
+```bash
+# Standard Nostr clients work out of the box!
+nak req -k 1 --limit 10 ws://localhost:8080
+
+# Publish via WebSocket
+echo '{"kind":1,"content":"hello","tags":[]}' | nak event --sec <nsec> | nak publish ws://localhost:8080
 ```
 
 ## gRPC API
@@ -73,13 +79,18 @@ See [proto/nostr/v1/nostr.proto](proto/nostr/v1/nostr.proto) for the full API.
 
 ## Current Status
 
-**Phase 1: gRPC Relay**
+**Phase 1: Complete** ✅
 - ✅ SQLite storage with binary-first design
 - ✅ Event validation (ID, signature)
 - ✅ gRPC publish/query API
 - ✅ Subscribe/streaming (real-time event delivery)
 - ✅ Subscription management (filter matching, fan-out)
-- ⏳ WebSocket server (planned for Nostr client compatibility)
+- ✅ **WebSocket server (NIP-01) - standard Nostr clients work!**
+
+**Compatible with:**
+- Any gRPC client (custom or generated)
+- Any Nostr client (Damus, Amethyst, Snort, Iris, Gossip, etc.)
+- nak CLI for testing
 
 ## Development