more changes to ios runs-on spec

.gitea/workflows/ci.yml

@@ -210,7 +210,7 @@ jobs:
   # ── Stage 2 (parallel): iOS build ───────────────────────────────
   build-ios:
     name: Build iOS
-    runs-on: [macos]
+    runs-on: [macos-arm64]
     needs: [lint, test]
     steps:
       - name: Checkout