feat(v3.13.0): settings live DB reads, remove Directus/Appwrite, admin stats

Settings fixes:
- MAX_SITES_PER_USER, USER_RATE_LIMIT_PER_MIN/HR now read from DB settings
  table (DB > ENV > default), so dashboard/settings changes apply without
  restart. Sync cache refreshed on every save or delete.
- /api/me reports the live DB value for max_sites_per_user.

Admin improvements:
- Admin users bypass per-user rate limiting entirely (role=admin or ADMIN_EMAILS).
- Admin Overview now shows platform stats: registered users, new users (7d),
  total user sites, available tools.

Plugin cleanup:
- Appwrite and Directus plugins removed from the active registry (8 plugins
  now: WordPress, WooCommerce, WordPress Specialist, Gitea, n8n, Supabase,
  OpenPanel, Coolify). Plugin code is retained for future re-enabling.
- Settings page plugin visibility list updated to match.

Mobile onboarding:
- Stepper steps on narrow viewports stack vertically with correct full border
  and rounded corners on each step.

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

plugins/ai_image/providers/openrouter.py

@@ -124,15 +124,18 @@ class OpenRouterProvider(BaseImageProvider):
         requested_model = request.model or _DEFAULT_MODEL
         replacement = _DEPRECATED_MODELS.get(requested_model)
         if replacement is not None:
-            raise ProviderError(
-                "PROVIDER_MODEL_DEPRECATED",
-                (
-                    f"OpenRouter model '{requested_model}' is deprecated. "
-                    f"Use '{replacement}' instead."
-                ),
-                {"requested_model": requested_model, "replacement_model": replacement},
+            # Auto-substitute deprecated → GA so per-site defaults pinned
+            # before the GA promotion don't break the generate-and-upload
+            # flow. Logged at WARNING so operators notice and can
+            # repin the site default in the dashboard.
+            _logger.warning(
+                "openrouter: model %r is deprecated; using %r instead",
+                requested_model,
+                replacement,
             )
-        model = requested_model
+            model = replacement
+        else:
+            model = requested_model
 
         # Chat-completions shape with image modality declared. The
         # prompt is sent as the single user message; size hints are