Add macOS configuration files and implement license flavor patching

- Created AppInfo.xcconfig, Debug.xcconfig, Release.xcconfig, and Warnings.xcconfig for macOS Runner target.
- Added entitlements files for DebugProfile and Release configurations to enable app sandboxing.
- Implemented Info.plist for application metadata and MainFlutterWindow.swift for window management.
- Added unit tests in RunnerTests.swift and widget tests in widget_test.dart.
- Updated pubspec.lock and pubspec.yaml to include flutter_lints and updated dependencies.
- Enhanced verify_aot_patch.dart for better AOT patching support and added utility functions.
- Included web assets: favicon, icons, index.html, and manifest.json for web deployment.

Signed-off-by: Tony <tonylu@tony-cloud.com>

scripts/sync_open_sources.sh

@@ -2,21 +2,56 @@
 set -euo pipefail
 
 ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+DART_SRC="${DART_SRC:-$ROOT/dart-sdk-new}"
+DART_TARGET="$ROOT/flutter/engine/src/flutter/third_party/dart"
 UPDATER_SRC="${UPDATER_SRC:-$ROOT/updater}"
 UPDATER_URL="${UPDATER_URL:-https://github.com/shorebirdtech/updater.git}"
 TARGET="$ROOT/flutter/engine/src/flutter/third_party/updater"
 
+is_git_checkout() {
+  git -C "$1" rev-parse --git-dir >/dev/null 2>&1
+}
+
+echo "[open-source-sync] dart source: $DART_SRC"
+echo "[open-source-sync] dart target: $DART_TARGET"
 echo "[open-source-sync] updater source: $UPDATER_SRC"
 echo "[open-source-sync] target: $TARGET"
 
+mkdir -p "$(dirname "$DART_TARGET")"
 mkdir -p "$(dirname "$TARGET")"
 
+if [[ -L "$DART_TARGET" ]]; then
+  echo "[open-source-sync] Dart target is already a symlink."
+elif is_git_checkout "$DART_TARGET"; then
+  echo "[open-source-sync] Dart target is already a git checkout."
+elif [[ -e "$DART_TARGET" ]]; then
+  echo "Dart target exists but is not a symlink or git checkout: $DART_TARGET" >&2
+  exit 1
+elif is_git_checkout "$DART_SRC"; then
+  rel_target="$(python3 - "$DART_TARGET" "$DART_SRC" <<'PY'
+import os
+import sys
+print(os.path.relpath(sys.argv[2], os.path.dirname(sys.argv[1])))
+PY
+)"
+  ln -s "$rel_target" "$DART_TARGET"
+  echo "[open-source-sync] linked Dart SDK checkout into Flutter engine."
+else
+  echo "Dart source checkout is missing: $DART_SRC" >&2
+  exit 1
+fi
+
+if [[ ! -f "$DART_TARGET/runtime/vm/dart_api_impl.h" ]]; then
+  echo "Dart checkout is missing runtime/vm/dart_api_impl.h" >&2
+  exit 1
+fi
+
 if [[ -L "$TARGET" ]]; then
   echo "[open-source-sync] updater target is already a symlink."
   exit 0
 fi
 
-if [[ -d "$TARGET/.git" ]]; then
+if is_git_checkout "$TARGET"; then
   echo "[open-source-sync] updating existing updater checkout."
   git -C "$TARGET" fetch --tags origin
   git -C "$TARGET" checkout "${UPDATER_REVISION:-main}"
@@ -26,7 +61,7 @@ if [[ -d "$TARGET/.git" ]]; then
 elif [[ -e "$TARGET" ]]; then
   echo "target exists but is not a symlink or git checkout: $TARGET" >&2
   exit 1
-elif [[ -d "$UPDATER_SRC/.git" ]]; then
+elif is_git_checkout "$UPDATER_SRC"; then
   rel_target="$(python3 - "$TARGET" "$UPDATER_SRC" <<'PY'
 import os
 import sys