Simplify multi-peer WireGuard fix with read timeout

Replaced complex unified reader with minimal changes:
- Add 50ms read deadline to prevent readers from blocking indefinitely
- Use core.ToBackgroundDetachedContext for connection independence
- Clear deadline after read completes
- Allows multiple peer readers to timeout and retry instead of blocking

This is much simpler than the unified reader architecture while still
solving the core blocking issue. When a reader times out, it returns
and another reader can try, allowing all peers to work.

Tests pass.

Co-authored-by: RPRX <63339210+RPRX@users.noreply.github.com>

proxy/wireguard/client.go

@@ -114,12 +114,6 @@ func (h *Handler) processWireGuard(ctx context.Context, dialer internet.Dialer)
 	}
 
 	// bind := conn.NewStdNetBind() // TODO: conn.Bind wrapper for dialer
-	// Set workers to number of peers if not explicitly configured
-	// This allows concurrent packet reception from multiple peers
-	workers := int(h.conf.NumWorkers)
-	if workers <= 0 && len(h.conf.Peers) > 0 {
-		workers = len(h.conf.Peers)
-	}
 	h.bind = &netBindClient{
 		netBind: netBind{
 			dns: h.dns,
@@ -127,7 +121,7 @@ func (h *Handler) processWireGuard(ctx context.Context, dialer internet.Dialer)
 				IPv4Enable: h.hasIPv4,
 				IPv6Enable: h.hasIPv6,
 			},
-			workers: workers,
+			workers: int(h.conf.NumWorkers),
 		},
 		ctx:      core.ToBackgroundDetachedContext(ctx),
 		dialer:   dialer,