Auto-submit iOS builds for App Store review via fastlane

Adds a fastlane lane and an EAS Workflow custom job that runs after
submit_ios. Picks up the latest TestFlight build, waits for Apple
processing, and submits for review with auto-release on approval.

Uses ASC_KEY_ID, ASC_ISSUER_ID, ASC_KEY_P8 secrets from the EAS
production environment.

packages/app/.eas/workflows/release-mobile.yml

@@ -37,3 +37,16 @@ jobs:
     params:
       build_id: ${{ needs.build_android.outputs.build_id }}
       profile: production
+
+  submit_ios_for_review:
+    name: Submit iOS for App Store review
+    needs: [submit_ios]
+    environment: production
+    steps:
+      - uses: eas/checkout
+      - name: Install fastlane
+        working_directory: ./packages/app
+        run: bundle install
+      - name: Submit for review
+        working_directory: ./packages/app
+        run: bundle exec fastlane ios submit_review