🔄 chore: Consolidate agent model imports across middleware and tests from rebase

- Updated imports for `createAgent` and `getAgent` to streamline access from a unified `~/models` path.
- Enhanced test files to reflect the new import structure, ensuring consistency and maintainability across the codebase.
- Improved clarity by removing redundant imports and aligning with the latest model updates.

api/server/services/Endpoints/agents/initialize.spec.js

@@ -58,8 +58,8 @@ jest.mock('~/cache', () => ({
 }));
 
 const { initializeClient } = require('./initialize');
-const { createAgent } = require('~/models/Agent');
 const { User, AclEntry } = require('~/db/models');
+const { createAgent } = require('~/models');
 
 const PRIMARY_ID = 'agent_primary';
 const TARGET_ID = 'agent_target';