🚀 feat: Support Redis Clusters, Trusted Proxy Setting, And Toggle Meilisearch Indexing

[danny-avila]

Summary

Closes #5957

• Allow disabling Meilisearch <> Database Indexing Sync by Instance
• Added Redis cluster support with URL mapping, key prefix, max listeners, and optional TLS configuration using environment variables.
  • Originally Enhance Redis cluster support #5784
• Allow Configuration of Trusted Proxy Express setting
  • Originally Added the option to change the default trusted proxy #5916
• Updated .env.example to include settings for Redis, TRUST_PROXY, and MeiliSearch indexing, ensuring the Express server uses the configurable proxy value.

Documentation: LibreChat-AI/librechat.ai#243

Other Changes

• Removed the deprecated GitHub Question issue template to simplify repository maintenance.

Change Type

• New feature (non-breaking change which adds functionality)
• Documentation update

Testing

• Verified Redis connectivity in both single-node and cluster modes.
• Confirmed the TRUST_PROXY configuration by simulating reverse proxy requests to the Express server.
• Ran the MeiliSearch index sync process to ensure appropriate error handling and proper indexing behavior.
• Ensured that the removal of the GitHub template does not impact repository operations.

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my 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
• Any changes dependent on mine have been merged and published in downstream modules