Fix find tool filters by mapping many-to-one relations to fieldId (#15716)

**Root Cause**  
Many-to-one relation filters were being exposed under the relation name
(e.g., `company`) instead of the corresponding foreign-key attribute
(e.g., `companyId`).

**Change**  
- Detect many-to-one relation metadata and remap those filter keys to
`<fieldName>Id`.
- Removed some unused code unrelated to this fix.

packages/twenty-server/src/engine/core-modules/ai/controllers/ai.controller.ts

@@ -20,7 +20,7 @@ import { WorkspaceEntity } from 'src/engine/core-modules/workspace/workspace.ent
 import { AuthWorkspace } from 'src/engine/decorators/auth/auth-workspace.decorator';
 import { WorkspaceAuthGuard } from 'src/engine/guards/workspace-auth.guard';
 
-export interface ChatRequest {
+interface ChatRequest {
   messages: ModelMessage[];
   temperature?: number;
   maxOutputTokens?: number;