🛡️ feat: Rate Limiting for Conversation Forking

[danny-avila]

Summary

I implemented fork rate limiters on the API to limit conversation forking requests per IP and user, improved error feedback and logging, and clarified error messages for downstream users.

• Added forkIpLimiter and forkUserLimiter middleware to the /fork route to prevent abuse, with configuration via environment variables and Redis support for distributed tracking
• Updated the Fork UI to show a specific error message when user exceeds the fork rate limit (HTTP 429)
• Added a new translation string for the fork rate limit error
• Improved error logging when fetching conversations by using the logger from the new data-schemas package for consistency
• Updated error message for MeiliMongooseModel.deleteMany to clarify that a slow startup may trigger syncing due to deletion issues, making warnings more actionable
• Refactored limiter utility imports for better maintainability by using utilities from their respective package modules
• Suggested testing the fork rate limit system by attempting to fork conversations rapidly from both a single user and IP address, ensuring error messages are delivered as expected and Redis integration is functional if enabled

Test Configuration:

• Unit tested fork limiters in isolation
• Manually tested by forking conversations beyond the configured rate limits and verified correct error message appears in UI
• Verified error logs are generated when exceptions occur in fetching conversations

Change Type

• New feature (non-breaking change which adds functionality)
• Documentation update
• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes