add an API of delete llm supplier (#2556)

### What problem does this PR solve?

#1853

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/llm_app.py

     return get_json_result(data=True)
 
 
+@manager.route('/delete_factory', methods=['POST'])
+@login_required
+@validate_request("llm_factory")
+def delete_llm():
+    req = request.json
+    TenantLLMService.filter_delete(
+            [TenantLLM.tenant_id == current_user.id, TenantLLM.llm_factory == req["llm_factory"]])
+    return get_json_result(data=True)
+
+
 @manager.route('/my_llms', methods=['GET'])
 @login_required
 def my_llms():