refactor(db): replace connectDb import paths and introduce new connect module

- Updated import paths for connectDb across various files to use the new centralized connect module.
- Removed the old connectDb file to streamline the database connection logic.
- Ensured all tests and models reference the new connection method for consistency.

api/strategies/openidStrategy.js

@@ -38,7 +38,7 @@ class CustomOpenIDStrategy extends OpenIDStrategy {
   }
 }
 
-const db = require('~/lib/db/connectDb');
+const db = require('db/connect');
 const { getBalanceConfig } = require('~/server/services/Config');
 
 let crypto;