Add MongoDB connection support

- Introduced MongoDB connection router and schemas.
- Updated app connection enums and maps to include MongoDB.
- Implemented validation and connection functions for MongoDB.
- Enhanced app connection service to handle MongoDB credentials.

frontend/src/hooks/api/appConnections/enums.ts

@@ -39,6 +39,7 @@ export enum AppConnection {
   Northflank = "northflank",
   Okta = "okta",
   Redis = "redis",
+  MongoDB = "mongodb",
   LaravelForge = "laravel-forge",
   Chef = "chef"
 }