Fix step 9 registration failure - correct file verification

The registration function creates '-server-routes.yml'
but the verification was checking for 'docker-provider-.yml'.

Changes:
- Updated file verification to check for correct filenames
- Added DOMAIN variable loading in add_remote_server_to_traefik()
- Replaced hard-coded domain with ${DOMAIN} variable in route rules
- Routes now use dynamic domain from .env instead of hard-coded value

This fixes the 'docker-provider file not created' error in step 9.

scripts/ez-homelab.sh

@@ -1828,10 +1828,10 @@ register_remote_server_with_core() {
         add_remote_server_to_traefik "${SERVER_IP}" "${SERVER_HOSTNAME}"
         
         # Verify files were created
-        if [ -f "/opt/stacks/core/traefik/dynamic/docker-provider-${SERVER_HOSTNAME}.yml" ]; then
-            echo "SUCCESS: docker-provider file created"
+        if [ -f "/opt/stacks/core/traefik/dynamic/${SERVER_HOSTNAME}-server-routes.yml" ]; then
+            echo "SUCCESS: server routes file created"
         else
-            echo "ERROR: docker-provider file not created"
+            echo "ERROR: server routes file not created"
             exit 1
         fi
         
@@ -1858,7 +1858,7 @@ EOF
     if [ $ssh_exit_code -eq 0 ] && echo "$ssh_output" | grep -q "SUCCESS: Registration complete"; then
         log_success "Successfully registered with core server"
         log_info "Files created on core server:"
-        echo "  - /opt/stacks/core/traefik/dynamic/docker-provider-${SERVER_HOSTNAME}.yml"
+        echo "  - /opt/stacks/core/traefik/dynamic/${SERVER_HOSTNAME}-server-routes.yml"
         echo "  - /opt/stacks/core/traefik/dynamic/sablier-middleware-${SERVER_HOSTNAME}.yml"
         return 0
     else