fix(docker): copy scaffold templates into runner stage for fresh project creation

Made-with: Cursor

Dockerfile

@@ -44,6 +44,9 @@ COPY --from=builder /app/node_modules/@prisma ./node_modules/@prisma
 COPY --from=builder /app/node_modules/@next-auth ./node_modules/@next-auth
 COPY --from=builder /app/prisma ./prisma
 
+# Scaffold templates are read at runtime via fs — must be in the runner image
+COPY --from=builder /app/lib/scaffold ./lib/scaffold
+
 # Copy and set up entrypoint
 COPY --chown=nextjs:nodejs entrypoint.sh ./entrypoint.sh