Fix fluwx CocoaPods iOS workflow setup

[Copilot]

The iOS build — fluwx (CocoaPods) Actions job was building the example app without preparing the CocoaPods workspace first. In that state, Xcode attempted SwiftPM resolution and failed on the local FlutterFramework package path.

• Workflow change

  • Align the fluwx CocoaPods lane with the existing fluwx_no_pay CocoaPods lane.
  • Install Pods before invoking flutter build ios --no-codesign.

• Failure mode addressed

  • Prevent the CocoaPods job from falling through to SwiftPM package resolution.
  • Ensure the iOS example is built from the generated Pods workspace in CocoaPods mode.

• Updated job snippet

  - name: Build fluwx example (CocoaPods)
    run: |
      cd packages/fluwx/example
      flutter pub get
      cd ios
      pod repo update
      pod install
      cd ..
      flutter build ios --no-codesign