feat(admin/models): delete an added model with inline confirm

Backend: AiModelRepository.delete() + DELETE /api/admin/models/{id} (owner-only,
audited) in the RPC-served admin router; session commits per request.
Frontend: api.adminDeleteModel() (WebSocket RPC DELETE) and a per-row حذف
action with a two-step inline confirm (تأیید حذف / انصراف) that removes the
row from state on success. tsc clean, py_compile clean.

apps/api/app/interfaces/http/routers/admin.py

@@ -215,6 +215,28 @@ async def create_model(
     return _model_out(model)
 
 
+@router.delete("/models/{model_id}", status_code=status.HTTP_200_OK)
+async def delete_model(
+    model_id: str,
+    request: Request,
+    owner: User = Depends(require_platform_owner),
+    session: AsyncSession = Depends(get_session),
+) -> dict:
+    repo = AiModelRepository(session)
+    existing = await repo.get(model_id)
+    if existing is None:
+        raise NotFoundError("مدلی با این شناسه یافت نشد.")
+    await repo.delete(model_id)
+    ip, ua = client_meta(request)
+    await record_audit(
+        session, action=AuditAction.MODEL_CHANGE, actor_user_id=owner.id,
+        target_type="model", target_id=model_id,
+        metadata={"internal_name": existing.internal_name, "deleted": True},
+        ip=ip, user_agent=ua,
+    )
+    return {"ok": True}
+
+
 # ---------------------------------------------------------------------------
 # Routing policies
 # ---------------------------------------------------------------------------