feat(manager): allow manager to create auto-approved campaigns and tests from templates

A manager organizes and validates work, so their own campaigns skip the
draft -> submit -> pending_approval queue and go straight to active with
the start_date they provide (they're the same role that would otherwise
approve it). Manager can also now create tests from the catalog, same as
red_lead/blue_lead.

frontend/src/api/campaigns.ts

@@ -73,6 +73,9 @@ export interface CampaignCreatePayload {
   target_platform?: string;
   tags?: string[];
   scheduled_at?: string;
+  // Only honored when the creator is a manager — auto-approves the
+  // campaign immediately instead of queuing it for later approval.
+  start_date?: string;
 }
 
 export interface AddTestPayload {