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>

deploy-to-coolify.example.sh

@@ -79,8 +79,8 @@ COOLIFY_DESTINATION_UUID="eg0g8s04soo84ock8kw4wkgo"  # coolify destination
 # Repository URL
 REPO_URL="https://git.startanaicompany.com/${GITEA_USERNAME}/${GITEA_REPO_NAME}.git"
 
-# Domain
-FULL_DOMAIN="${SUBDOMAIN}.recruitai.startanaicompany.com"
+# Domain (e.g., annarecruit.startanaicompany.com or johnrecruit.startanaicompany.com)
+FULL_DOMAIN="${SUBDOMAIN}recruit.startanaicompany.com"
 
 echo "========================================="
 echo "  AI Recruitment Site Deployment"