fix: add VITE_OIDC_REDIRECT_URI and build args for frontend

- Add VITE_OIDC_REDIRECT_URI to .env.example and docker-compose files
- Pass OIDC variables as build args in Dockerfile (build-time only)
- Update both docker-compose.prod.yml and docker-compose.traefik.yml
- Fixes undefined OIDC variables causing 404 on login redirect

.env.example

@@ -33,6 +33,7 @@ TOOL_SUBDOMAIN_PATTERN={tool}-{project}-{user}.tools.localhost
 VITE_API_URL=http://localhost:8000
 VITE_OIDC_ISSUER=https://auth.example.com/application/o/headquarter/
 VITE_OIDC_CLIENT_ID=your-client-id
+VITE_OIDC_REDIRECT_URI=https://headquarter.commumedia.org/callback
 
 # Secrets (generate strong random values for production)
 SECRET_ENCRYPTION_KEY=change-me-in-production