v0.22.1: Fix setup wizard bugs (detection, CSRF panic, version display, IP)

- NeedsSetup: only check for empty customer.id (not "demo-felhom")
- renderError: pass *http.Request to ensureCSRFToken (was nil → panic)
- Welcome template: remove redundant "v" prefix from version display
- IP detection: read HOST_IP env var for Docker container awareness
- docker-setup.sh: inject HOST_IP into generated docker-compose.yml
- Add logging for Hub config download in setup wizard

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

controller/internal/setup/templates/setup_welcome.html

@@ -12,7 +12,7 @@
         <div class="setup-header">
             <img src="/static/felhom-logo.svg" alt="Felhom.eu" style="width: 120px;">
             <h1>Felhom Szerver Beállítás</h1>
-            <p style="color: var(--text-secondary, #8b949e); font-size: 0.85rem;">v{{.Version}}</p>
+            <p style="color: var(--text-secondary, #8b949e); font-size: 0.85rem;">{{.Version}}</p>
         </div>
 
         {{if .AccessURLs}}