Fix domain format to match desired pattern

Changed from double subdomain format (anna.recruitai.startanaicompany.com)
to single concatenated format (annarecruit.startanaicompany.com).

Changes:
- deploy-to-coolify.example.sh: Updated FULL_DOMAIN to ${SUBDOMAIN}recruit.startanaicompany.com
- .env.example: Updated comment to show correct example (annarecruit.startanaicompany.com)
- README.md: Updated domain examples to use correct format
- COOLIFY_SETUP.md: Updated all DNS and domain examples to use correct format

This ensures deployments generate domains like:
- annarecruit.startanaicompany.com (when SUBDOMAIN=anna)
- johnrecruit.startanaicompany.com (when SUBDOMAIN=john)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.env.example

@@ -35,7 +35,7 @@ SOCIAL_FACEBOOK=
 # ===================================
 # Deployment Configuration
 # ===================================
-# Your custom subdomain (e.g., 'yourname' becomes yourname.recruitai.startanaicompany.com)
+# Your custom subdomain (e.g., 'anna' becomes annarecruit.startanaicompany.com)
 SUBDOMAIN=yourname
 
 # Your Gitea username and repository name