chore(flutter): generate CocoaPods files for restaurant_finder macOS client

[jacobsimionato]

Description

This PR checks in the auto-generated CocoaPods files (Podfile and related .xcconfig configurations) for the restaurant_finder Flutter application's macOS build target.

Rationale

When running scripts/fix_format.sh, the script executes flutter pub get in the Flutter/Dart workspace. On macOS (darwin), this automatically bootstraps and generates the standard CocoaPods configuration files (Podfile, Flutter-Debug.xcconfig, Flutter-Release.xcconfig) for the restaurant_finder/app macOS target. Checking these generated files into the repository ensures that developers building the macOS target have a pre-configured CocoaPods environment and that formatting/getting dependencies remains consistent and clean across all environments.

Description of Changes

• samples/client/flutter/restaurant_finder/app/macos/Podfile: Added the standard CocoaPods platform setup and runner targets for the macOS application.
• samples/client/flutter/restaurant_finder/app/macos/Flutter/Flutter-Debug.xcconfig: Appended the target support configuration file include for Pods in Debug mode.
• samples/client/flutter/restaurant_finder/app/macos/Flutter/Flutter-Release.xcconfig: Appended the target support configuration file include for Pods in Release mode.

Testing/Running Instructions

To test or verify these changes locally on a macOS machine:

1. Ensure Flutter is installed and configured.
2. In the repository root, run the formatter/workspace update script:

   ./scripts/fix_format.sh

3. Verify that the files remain consistent and generated.
4. (Optional) Run/build the macOS client to verify compiling succeeds:

   cd samples/client/flutter/restaurant_finder/app
   flutter build macos

---

Pre-launch Checklist

• I signed the CLA.
• I read the Contributors Guide.
• I read the Style Guide.
• I have added updates to the CHANGELOG.
• My code changes (if any) have tests.
• If my branch is on fork, I have verified that scripts/e2e_test.sh passes.

[gemini-code-assist]

Code Review

This pull request adds CocoaPods configuration for the macOS target of the Flutter restaurant finder sample app, introducing a new Podfile and updating the debug and release xcconfig files. The reviewer recommends running pod install and committing the resulting Podfile.lock to ensure consistent dependency versions across development and CI environments.

[gemini-code-assist]

Since you are checking in the Podfile for the macOS target, it is highly recommended to also run pod install and commit the resulting Podfile.lock file. Tracking Podfile.lock ensures that all developers and CI environments build with the exact same dependency versions, preventing 'works on my machine' issues and unexpected build failures due to upstream updates.