feat(middleware): support ?token= query param fallback for browser WebSocket auth

internal/transport/http/middleware/auth.go

@@ -99,11 +99,19 @@ func UserIDFromContext(ctx context.Context) (uuid.UUID, bool) {
 // prefix; case-insensitive matching is intentionally NOT performed
 // because RFC 6750 specifies the literal "Bearer" scheme name and being
 // strict here keeps the parsing surface small.
+//
+// As a fallback, ?token= query parameter is accepted for endpoints that
+// cannot send custom headers (notably browser-native WebSocket connections).
+// Callers must keep token lifetimes short so the URL-borne token is not a
+// long-lived secret should it be logged by intermediaries.
 func extractBearer(r *http.Request) string {
 	h := r.Header.Get("Authorization")
 	const prefix = "Bearer "
-	if !strings.HasPrefix(h, prefix) {
-		return ""
-	}
+	if strings.HasPrefix(h, prefix) {
 		return strings.TrimSpace(h[len(prefix):])
 	}
+	if q := r.URL.Query().Get("token"); q != "" {
+		return q
+	}
+	return ""
+}