feat: [database] codebridge DB connection 적용 (merge 후 재적용)

- 78개 MNG 전용 모델에 $connection = 'codebridge' 재적용
- config/database.php codebridge connection 포함

app/Models/Admin/AdminPmProject.php

@@ -28,7 +28,6 @@ class AdminPmProject extends Model
 {
     use SoftDeletes;
 
-    protected $connection = 'codebridge';
     protected $table = 'admin_pm_projects';
 
     protected $fillable = [