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/ai-config/page.tsx

@@ -2,11 +2,25 @@ import type { Metadata } from "next";
 import { Badge } from "@/components/ui/badge";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import { CheckCircle, XCircle, Database, Cpu } from "lucide-react";
-import Link from "next/link";
 import { getAllSiteSettings } from "@/lib/site-settings";
+import { AdminSettingsForm } from "@/components/admin/admin-settings-form";
+import { AdminDefaultModelForm } from "@/components/admin/admin-default-model-form";
 
 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,
+  },
+];
+
 function resolveProvider(settings: Record<string, { value: string | null }>) {
   if (settings["OPENROUTER_API_KEY"]?.value) return { provider: "OpenRouter", description: "Routes to many models via openrouter.ai" };
   if (settings["OPENAI_API_KEY"]?.value) return { provider: "OpenAI", description: "Direct OpenAI API (GPT-4 etc.)" };
@@ -26,21 +40,17 @@ export default async function AdminAiConfigPage() {
   ];
 
   return (
-    <div className="space-y-6">
+    <div className="space-y-8">
       <div>
         <h1 className="text-2xl font-bold tracking-tight">AI Configuration</h1>
         <p className="text-muted-foreground text-sm mt-1">
-          Current AI provider settings. Override values in{" "}
-          <Link href="/admin/settings" className="text-primary underline-offset-4 hover:underline">
-            Site Settings
-          </Link>
-          .
+          Provider keys, routing, and default models for AI generation. DB values here take precedence over environment variables — clear a value to fall back to the env var.
         </p>
       </div>
 
       <Card>
         <CardHeader>
-          <CardTitle className="text-base">Active Provider</CardTitle>
+          <CardTitle className="text-base">Active Provider (fallback, no default set below)</CardTitle>
         </CardHeader>
         <CardContent>
           <div className="flex items-center gap-3">
@@ -48,7 +58,7 @@ export default async function AdminAiConfigPage() {
             <span className="text-muted-foreground text-sm">{active.description}</span>
           </div>
           <p className="text-xs text-muted-foreground mt-3">
-            Priority: OpenRouter → OpenAI → Anthropic → Ollama (first configured key wins).
+            Priority: OpenRouter → OpenAI → Anthropic → Ollama (first configured key wins) — only when a user has no personal preference, no BYOK key, and no default is set for that use case below.
           </p>
         </CardContent>
       </Card>
@@ -103,6 +113,21 @@ export default async function AdminAiConfigPage() {
           </div>
         </CardContent>
       </Card>
+
+      {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>
   );
 }