feat: add railway configuration and seed script for PR environment setup

[JoachimLK]

This pull request adds support for seeding lightweight demo data specifically for pull request (PR) environments, making it easier to preview and test the application in preview deployments (such as Railway PR environments). The changes include a new seed script, new npm scripts, and Railway deployment configuration to automate the seeding process.

PR Environment Seeding Support

• Added a new script server/scripts/seed-pr.ts that seeds demo data for PR environments, including 1 organization, 5 recruiter users, 5 candidates, 5 jobs, and 5 applications. The script is idempotent and only runs in PR/preview environments or when explicitly forced.
• Introduced a new npm script db:seed:pr in package.json to run the PR seed script.
• Added a new npm script start:railway that pushes the database schema, seeds the PR data, and starts the server, streamlining Railway deployments.
• Added a railway.json configuration file to automatically run the PR seed script before deployments and start the application with the correct command in Railway environments.## Summary

[railway-app]

🚅 Deployed to the applirank-pr-14 environment in applirank

Service	Status	Web	Updated (UTC)
applirank	✅ Success (View Logs)	Web	Feb 20, 2026 at 10:48 am