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/components/admin/signups-toggle.tsx

@@ -6,23 +6,23 @@ import { Label } from "@/components/ui/label";
 import { Switch } from "@/components/ui/switch";
 
 export function SignupsToggle({ initialDisabled }: { initialDisabled: boolean }) {
-  const [disabled, setDisabled] = useState(initialDisabled);
+  const [enabled, setEnabled] = useState(!initialDisabled);
   const [saving, setSaving] = useState(false);
 
   async function handleChange(checked: boolean) {
     setSaving(true);
-    const previous = disabled;
-    setDisabled(checked);
+    const previous = enabled;
+    setEnabled(checked);
     try {
       const res = await fetch("/api/v1/admin/settings", {
         method: "PUT",
         headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ SIGNUPS_DISABLED: checked ? "true" : null }),
+        body: JSON.stringify({ SIGNUPS_DISABLED: checked ? null : "true" }),
       });
       if (!res.ok) throw new Error("Save failed");
-      toast.success(checked ? "Signups disabled" : "Signups enabled");
+      toast.success(checked ? "Signups enabled" : "Signups disabled");
     } catch {
-      setDisabled(previous);
+      setEnabled(previous);
       toast.error("Failed to update");
     } finally {
       setSaving(false);
@@ -35,16 +35,16 @@ export function SignupsToggle({ initialDisabled }: { initialDisabled: boolean })
         <div>
           <h2 className="font-semibold text-lg">Signups</h2>
           <p className="text-sm text-muted-foreground mt-1">
-            When disabled, only people with a valid invite link can create an account.
+            When off, only people with a valid invite link can create an account.
           </p>
         </div>
         <div className="flex items-center gap-2 shrink-0">
-          <Label htmlFor="signups-disabled" className="text-sm">
-            {disabled ? "Disabled" : "Open"}
+          <Label htmlFor="signups-enabled" className="text-sm">
+            {enabled ? "Open" : "Disabled"}
           </Label>
           <Switch
-            id="signups-disabled"
-            checked={disabled}
+            id="signups-enabled"
+            checked={enabled}
             disabled={saving}
             onCheckedChange={(checked) => { void handleChange(checked); }}
           />