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/create-user-dialog.tsx

@@ -16,7 +16,7 @@ export function CreateUserDialog() {
   const [email, setEmail] = useState("");
   const [name, setName] = useState("");
   const [role, setRole] = useState<"user" | "moderator" | "admin">("user");
-  const [tier, setTier] = useState<"free" | "pro">("free");
+  const [tier, setTier] = useState<"free" | "pro" | "team">("free");
   const [saving, setSaving] = useState(false);
 
   async function handleCreate() {
@@ -85,6 +85,7 @@ export function CreateUserDialog() {
                   <SelectContent>
                     <SelectItem value="free">Free</SelectItem>
                     <SelectItem value="pro">Pro</SelectItem>
+                    <SelectItem value="team">Team</SelectItem>
                   </SelectContent>
                 </Select>
               </div>