feat: admin panel improvements (v0.34.0)

- Signups toggle was inverted (on = disabled) — flipped so on means
  open, matching how every other on/off toggle in the app reads.
- Moved AI provider keys and default-model settings from Site
  Settings to AI Config, so all AI setup lives in one place instead
  of split across two pages with a cross-link.
- Admin overview: added new users/recipes (7d), recipes cooked (7d),
  pending reports (linked, highlighted if > 0), storage used this
  month, active webhooks, and API keys issued — previously just 4
  lifetime totals.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/app/admin/settings/page.tsx

@@ -1,22 +1,11 @@
 import type { Metadata } from "next";
 import { getAllSiteSettings, isSignupsDisabled } from "@/lib/site-settings";
 import { AdminSettingsForm } from "@/components/admin/admin-settings-form";
-import { AdminDefaultModelForm } from "@/components/admin/admin-default-model-form";
 import { SignupsToggle } from "@/components/admin/signups-toggle";
 
 export const metadata: Metadata = {};
 
 const SETTING_GROUPS = [
-  {
-    title: "AI Provider Keys",
-    description: "Override the environment variable API keys at runtime. Values are encrypted at rest.",
-    keys: ["OPENAI_API_KEY", "ANTHROPIC_API_KEY", "OPENROUTER_API_KEY"] as const,
-  },
-  {
-    title: "AI Configuration",
-    description: "Provider routing and model defaults.",
-    keys: ["OPENROUTER_DEFAULT_MODEL", "OLLAMA_BASE_URL"] as const,
-  },
   {
     title: "Push Notifications (VAPID)",
     description: "Keys for web push notifications. Generate with: npx web-push generate-vapid-keys",
@@ -34,7 +23,8 @@ export default async function AdminSettingsPage() {
         <h1 className="text-2xl font-bold tracking-tight">Site Settings</h1>
         <p className="text-muted-foreground text-sm mt-1">
           Override .env values at runtime. DB values take precedence over environment variables.
-          Clear a value to fall back to the environment variable.
+          Clear a value to fall back to the environment variable. AI provider keys and model
+          defaults have moved to AI Config.
         </p>
       </div>
 
@@ -43,17 +33,6 @@ export default async function AdminSettingsPage() {
       {SETTING_GROUPS.map((group) => (
         <AdminSettingsForm key={group.title} group={group} settings={settings} />
       ))}
-
-      <AdminDefaultModelForm
-        initialValues={{
-          DEFAULT_TEXT_PROVIDER: settings["DEFAULT_TEXT_PROVIDER"]?.value ?? null,
-          DEFAULT_TEXT_MODEL: settings["DEFAULT_TEXT_MODEL"]?.value ?? null,
-          DEFAULT_VISION_PROVIDER: settings["DEFAULT_VISION_PROVIDER"]?.value ?? null,
-          DEFAULT_VISION_MODEL: settings["DEFAULT_VISION_MODEL"]?.value ?? null,
-          DEFAULT_MEAL_PLAN_PROVIDER: settings["DEFAULT_MEAL_PLAN_PROVIDER"]?.value ?? null,
-          DEFAULT_MEAL_PLAN_MODEL: settings["DEFAULT_MEAL_PLAN_MODEL"]?.value ?? null,
-        }}
-      />
     </div>
   );
 }