Fix Dockerfile for NextAuth + Prisma deployment

Add Prisma support to Docker build:
- Run 'prisma generate' during Docker build
- Copy Prisma client and schema to production image
- Remove 'prisma db push' from build script (runs at startup)
- Enable Next.js standalone output mode
- Add db-setup.sh script for runtime migrations

This fixes the deployment failure where Prisma wasn't available.

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -4,7 +4,7 @@
   "private": true,
   "scripts": {
     "dev": "next dev",
-    "build": "prisma generate && prisma db push --accept-data-loss && next build",
+    "build": "next build",
     "start": "next start",
     "lint": "eslint",
     "postinstall": "prisma generate",