refactor: Remove unreachable dead code branches

- checkOrigin: Remove redundant same-origin check at line 155 that was
  already handled at line 116 (origin == requestOrigin)

Function improved from 95.1% to 97.4% coverage.

internal/websocket/hub.go

@@ -151,11 +151,7 @@ func (h *Hub) checkOrigin(r *http.Request) bool {
 			return true
 		}
 
-		// Still check for exact same-origin match
+		// Note: same-origin match already handled above (line 116)
-		if origin == requestOrigin {
-			return true
-		}
-
 		log.Warn().
 			Str("origin", origin).
 			Str("requestOrigin", requestOrigin).