fix: cascade delete for responses and clean worker startup

apps/whatsapp-worker/package.json

@@ -5,7 +5,7 @@
     "scripts": {
         "dev": "tsx watch src/index.ts",
         "build": "pnpm --filter @repo/database generate && tsc --build",
-        "start": "(pnpm exec prisma db push --accept-data-loss || echo 'DB push failed, continuing...') ; npx tsx ../api/src/index.ts & sleep 5 && node dist/index.js & wait"
+        "start": "npx tsx ../api/src/index.ts & sleep 5 && node dist/index.js & wait"
     },
     "dependencies": {
         "@prisma/client": "^5.0.0",

packages/database/prisma/schema.prisma

@@ -104,7 +104,7 @@ model Response {
   mediaUrl     String?  // Voice/Image response
   createdAt    DateTime @default(now())
   
-  enrollment   Enrollment @relation(fields: [enrollmentId], references: [id])
+  enrollment   Enrollment @relation(fields: [enrollmentId], references: [id], onDelete: Cascade)
   user         User       @relation(fields: [userId], references: [id])
 }