fix(ios): add missing Google Sign In configuration for dev environment

[kodjima33]

Summary

Fixes Google Sign In crashes on iOS by adding missing OAuth configuration. This saved me significant debugging time.

Problem

• App crashed immediately when tapping "Sign in with Google"
• Crash occurred at GIDSignIn.m:517 due to missing GIDClientID
• After fixing that, API calls failed due to missing .dev.env file

Solution

1. Add GIDClientID to Info.plist - Required by Google Sign In SDK
2. Update Custom.xcconfig - Add GOOGLE_CLIENT_ID matching Firebase config
3. Update Podfile.lock - Include pasteboard plugin dependency

Testing

✅ Successfully tested Google Sign In flow on iOS simulator
✅ Backend API calls working correctly after sign-in
✅ Language selection and onboarding flow complete

Impact

Without these changes, any developer running in dev flavor mode would experience immediate crashes when trying to sign in with Google. This PR ensures the configuration works out of the box.

🤖 Generated with Claude Code

[gemini-code-assist]

Code Review

This pull request successfully resolves a crash on iOS related to Google Sign-In by adding the necessary configuration. The changes to Info.plist and Podfile.lock are correct. However, a critical security vulnerability has been introduced by hardcoding the GOOGLE_CLIENT_ID in app/ios/Flutter/Custom.xcconfig. This secret should be managed securely, for example, by using environment variables during the build process, rather than committing it to the repository.

[gemini-code-assist]

Hardcoding secrets like GOOGLE_CLIENT_ID and GOOGLE_REVERSE_CLIENT_ID in a version-controlled file poses a significant security risk. Although the file includes a comment advising against versioning it, its inclusion in this pull request indicates it is tracked by Git. Exposing these credentials could lead to security breaches if the repository is public or if unauthorized individuals gain access.

It is strongly recommended to remove these hardcoded values. Instead, they should be injected at build time from a secure source, such as environment variables in your CI/CD pipeline or a secrets management tool.

For example, you could generate this file dynamically during your build process:

# In your CI/CD script
echo "GOOGLE_CLIENT_ID=$GOOGLE_CLIENT_ID_SECRET" > app/ios/Flutter/Custom.xcconfig
echo "GOOGLE_REVERSE_CLIENT_ID=$GOOGLE_REVERSE_CLIENT_ID_SECRET" >> app/ios/Flutter/Custom.xcconfig

Afterward, ensure app/ios/Flutter/Custom.xcconfig is added to your .gitignore file to prevent it from being committed in the future.