fix: replace prisma migrate deploy with db push in CI pipeline

prisma migrate deploy requires pre-generated migration files which won't
exist when schema is edited directly. db push syncs schema directly.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -59,10 +59,10 @@ jobs:
             echo "[deploy] No failed migrations found"
           fi
 
-      - name: Run database migrations
+      - name: Sync database schema
         run: |
           cd /tmp/api-server
-          npx prisma migrate deploy
+          npx prisma db push --skip-generate
 
       - name: Deploy NestJS API
         run: |