fix(autumn): guard ensureTeamProvisioned with autumnClient null check

Without this guard, ensureTeamProvisioned makes a Supabase query to
resolve orgId even when autumnClient is null, only for every subsequent
Autumn API call to no-op. The team also never gets cached, so the
wasted query repeats on every call.

Co-Authored-By: micahstairs <micah@sideguide.dev>

apps/api/src/services/autumn/autumn.service.ts

@@ -258,6 +258,7 @@ export class AutumnService {
     orgId,
     name,
   }: EnsureTeamProvisionedParams): Promise<void> {
+    if (!autumnClient) return;
     if (this.isPreviewTeam(teamId)) return;
     // Fast path: team is already fully provisioned.
     if (this.ensuredTeams.has(teamId)) return;