feat: add Team billing tier

Widens the tier enum from free/pro to free/pro/team and every
"free" | "pro" cast that assumed exactly two tiers (~30 call sites:
every AI route's withAiQuota/checkAndIncrementTierLimit call, admin
user/invite management, upload quota checks, OpenAPI schemas). Team
sits above Pro with genuinely unlimited recipes/public-recipes (the
-1 sentinel, which Pro doesn't actually use — Pro uses large finite
numbers instead) and a higher AI-call/storage cap. Seeded via
db:seed, editable afterward from Admin > Tiers.

role (user/moderator/admin — permissions) and tier (free/pro/team —
billing limits) stay separate concepts, as they already were; this
does not touch role-based permissions.

Requires migration 0043 to run against a live DB — not applied in
this sandbox (no Docker here); run `pnpm db:migrate` then `pnpm db:seed`.

v0.44.0

apps/web/components/admin/user-editor.tsx

@@ -15,12 +15,12 @@ import { Label } from "@/components/ui/label";
 interface UserEditorProps {
   userId: string;
   currentRole: "user" | "moderator" | "admin";
-  currentTier: "free" | "pro";
+  currentTier: "free" | "pro" | "team";
 }
 
 export function UserEditor({ userId, currentRole, currentTier }: UserEditorProps) {
   const [role, setRole] = useState<"user" | "moderator" | "admin">(currentRole);
-  const [tier, setTier] = useState<"free" | "pro">(currentTier);
+  const [tier, setTier] = useState<"free" | "pro" | "team">(currentTier);
   const [saving, setSaving] = useState(false);
 
   async function handleSave() {
@@ -68,6 +68,7 @@ export function UserEditor({ userId, currentRole, currentTier }: UserEditorProps
             <SelectContent>
               <SelectItem value="free">Free</SelectItem>
               <SelectItem value="pro">Pro</SelectItem>
+              <SelectItem value="team">Team</SelectItem>
             </SelectContent>
           </Select>
         </div>