Fix: prisma not found in Docker runner stage

- Use direct node path to prisma CLI instead of npx
- Copy seed dependencies (bcryptjs, papaparse, tsx, esbuild) for manual seeding
- Copy package.json for module resolution

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker/docker-entrypoint.sh

@@ -2,7 +2,7 @@
 set -e
 
 echo "==> Running database migrations..."
-npx prisma migrate deploy
+node node_modules/prisma/build/index.js migrate deploy
 
 echo "==> Starting application..."
 exec node server.js