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/vite.config.ts

@@ -0,0 +1,38 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+import path from "node:path";
+
+// SPA build → core/templates/static/dist for Starlette to serve.
+// In dev, proxy /api, /auth, /dashboard, /static to the running Python server.
+export default defineConfig({
+  plugins: [react()],
+  base: "/static/dist/",
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "src"),
+    },
+  },
+  build: {
+    outDir: path.resolve(__dirname, "../core/templates/static/dist"),
+    emptyOutDir: true,
+    sourcemap: true,
+    assetsDir: "assets",
+  },
+  server: {
+    port: 5173,
+    proxy: {
+      "/api": "http://localhost:8000",
+      "/auth": "http://localhost:8000",
+      "/dashboard": "http://localhost:8000",
+      "/static": "http://localhost:8000",
+      "/health": "http://localhost:8000",
+      "/oauth": "http://localhost:8000",
+    },
+  },
+  test: {
+    environment: "jsdom",
+    globals: true,
+    setupFiles: ["./src/test/setup.ts"],
+    css: false,
+  },
+});