- Backend: added redeployApplication() to DeploymentsService that creates
a new deployment record and re-runs the full build+deploy pipeline
- Backend: added POST /deployments/applications/:appId/redeploy endpoint
- Frontend: added Redeploy button on app detail page, visible after first
deploy when no build is in progress
- For git-based apps: pulls latest code from repo on each redeploy
- For zip-based apps: rebuilds from last uploaded source code
keyhan