Update README.md

Update app.js

Update requirements.txt

Update requirements.txt

Create runtime.txt

Update ci.yml

additional settings

Optimize requirements.txt for production

Update API URL for production

Fix: Update CI/CD pipeline to latest action versions

Fix: Update actions/upload-artifact to v4

Initial commit: Job Tracker application v2.0.0

Initial commit: Job Tracker application with FastAPI backend and Vanilla JS frontend