feat(ci): restore iOS build on self-hosted macOS runner

.gitea/workflows/ci.yml

@@ -212,15 +212,50 @@ jobs:
     name: Build iOS
     runs-on: [self-hosted, macos]
     needs: [lint, test]
-    if: always()
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Check iOS build feasibility
+      - name: Setup Java 17
         run: |
-          OS=$(uname -s)
-          echo "INFO: iOS builds require macOS host with Xcode."
-          echo "Detected OS: $OS"
-          echo "Skipping iOS build - it will succeed as a no-op."
-          echo "To enable iOS builds, configure a native macOS runner with Xcode."
+          set -e
+          brew install openjdk@17 || true
+          export JAVA_HOME="/usr/local/opt/openjdk@17"
+          export PATH="$JAVA_HOME/bin:$PATH"
+          java -version
+
+      - name: Setup Flutter
+        run: |
+          set -e
+          curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/stable/macos/flutter_macos_${{ env.FLUTTER_VERSION }}-stable.tar.xz" \
+            -o /tmp/flutter.tar.xz
+          tar -xf /tmp/flutter.tar.xz -C "$PWD"
+          export PATH="$PWD/flutter/bin:$PATH"
+          flutter --version
+
+      - name: Install dependencies
+        run: |
+          export PATH="$PWD/flutter/bin:$PATH"
+          flutter pub get
+
+      - name: Generate stubs (lint gate support)
+        run: |
+          export PATH="$PWD/flutter/bin:$PATH"
+          python3 ci_stub_gen.py
+
+      - name: Run whitelabel build script
+        if: hashFiles('theme.json') != ''
+        run: |
+          export PATH="$PWD/flutter/bin:$PATH"
+          python3 build_whitelabel.py
+
+      - name: Build iOS (release, no-codesign)
+        run: |
+          export JAVA_HOME="/usr/local/opt/openjdk@17"
+          export PATH="$PWD/flutter/bin:$PATH"
+          flutter build ios --release --no-codesign
+
+      - name: List build outputs
+        run: |
+          echo "=== iOS build output ==="
+          ls -lh build/ios/iphoneos/ || true