chore: remove unused Prisma import from template-model service

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: strukalex

apps/backend-services/src/template-model/template-model.service.ts

@@ -3,7 +3,6 @@ import {
   FieldDefinition,
   FieldType,
   LabelingStatus,
-  Prisma,
 } from "@generated/client";
 import {
   ConflictException,