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>

web/src/main.tsx

@@ -0,0 +1,27 @@
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { BrowserRouter } from "react-router-dom";
+import { App } from "./App";
+import "./styles/globals.css";
+
+const qc = new QueryClient({
+  defaultOptions: {
+    queries: { refetchOnWindowFocus: false, retry: 1, staleTime: 10_000 },
+  },
+});
+
+const root = document.getElementById("app");
+if (!root) throw new Error("#app not found");
+
+const basename = window.location.pathname.startsWith("/dashboard") ? "/dashboard" : "/";
+
+createRoot(root).render(
+  <StrictMode>
+    <QueryClientProvider client={qc}>
+      <BrowserRouter basename={basename}>
+        <App />
+      </BrowserRouter>
+    </QueryClientProvider>
+  </StrictMode>,
+);