feat: multi role permission intersection (#15150)

Implements permission intersection (AND logic) to prevent permission
escalation when agents act on behalf of users.

### Changes:
- **Permission Intersection**: Operations requiring both user AND agent
permissions
- **RoleContext Type**: Unified type supporting single `roleId` or
multiple `roleIds` for intersection
- **CRUD Services**: Updated to accept `roleContext` for granular
permission control
- **Agent Integration**: Chat agents now use user + agent role
intersection for all operations
- **ORM Layer**: Enhanced `getRepository` to support multi-role
permission checks

### Related:
- Part 2 of ["Acting on behalf of user" concept
PR](https://github.com/twentyhq/twenty/pull/15103)

[Closes #1661](https://github.com/twentyhq/core-team-issues/issues/1661)

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-server/src/engine/twenty-orm/twenty-orm.manager.ts

@@ -74,8 +74,7 @@ export class TwentyORMManager {
 
     return workspaceDataSource.getRepository<T>(
       objectMetadataName,
-      false,
-      roleId,
+      roleId ? { unionOf: [roleId] } : undefined,
     );
   }