fix(api): use node_modules prisma binary in entrypoint

npx is unavailable in production image since npm is removed.
Use ./node_modules/.bin/prisma directly instead.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/docker-entrypoint.sh

@@ -2,7 +2,7 @@
 set -e
 
 echo "Running database migrations..."
-npx prisma migrate deploy --schema ./prisma/schema.prisma
+./node_modules/.bin/prisma migrate deploy --schema ./prisma/schema.prisma
 
 echo "Starting application..."
 exec node dist/main.js