Add missing MongoDB connection initialization to vault routes

[KGFCH2]

Summary

Fix API routes that use MongoDB without first initializing the DB connection.

Details

• Ensures vault routes call DB connect helper
• Prevents intermittent auth/data failure in API requests

Acceptance Criteria

• Vault routes initialize database connection
• Vault endpoints work consistently
• No DB connection errors remain in these routes

[ArmanKumar456]

Hi ,

I would like to work on this issue.

I can investigate the vault routes, ensure the MongoDB connection helper is properly initialized before database operations, and verify that the vault endpoints work consistently without connection-related errors.

Please assign this issue to me. under ELUSOC

Thank you!