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>

core/endpoints/factory.py

@@ -162,10 +162,13 @@ class MCPEndpointFactory:
         Returns:
             Plugin type or None for system tools
         """
-        # Check for wordpress_advanced first (before wordpress_)
-        # Tools are named: wordpress_advanced_wp_db_*, wordpress_advanced_bulk_*, wordpress_advanced_system_*
-        if tool_name.startswith("wordpress_advanced_"):
-            return "wordpress_advanced"
+        # Check the multi-word WordPress variant BEFORE the bare
+        # ``wordpress_`` prefix — tool names are
+        # ``wordpress_specialist_wp_plugin_list``,
+        # ``wordpress_create_post`` etc. (``wordpress_advanced`` was
+        # sunset in F.19.3.2-.3 / 2026-05-04.)
+        if tool_name.startswith("wordpress_specialist_"):
+            return "wordpress_specialist"
 
         if tool_name.startswith("wordpress_"):
             return "wordpress"