REFACTOR(app): use native ARM64 runner

- Switch to native ARM64 runner
- Remove QEMU emulation overhead

.github/workflows/build.yml

@@ -13,7 +13,7 @@ env:
 
 jobs:
   build-and-push:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-arm
     permissions:
       contents: write
       packages: write
@@ -26,9 +26,6 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3