fix: store tenant slug (not UUID) in current_tenant; remove plan trial periods

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

it0-web-admin/src/app/(admin)/layout.tsx

@@ -34,10 +34,12 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
     const isPlatformAdmin = Array.isArray(user.roles) &&
       (user.roles.includes('platform_admin') || user.roles.includes('platform_super_admin'));
     if (!isPlatformAdmin) {
-      apiClient<{ id: string; name: string; plan: string }>('/api/v1/auth/my-org')
+      apiClient<{ id: string; slug: string; name: string; plan: string }>('/api/v1/auth/my-org')
         .then((org) => {
-          setCurrentTenant({ id: org.id, name: org.name, plan: org.plan as any });
-          localStorage.setItem('current_tenant', JSON.stringify({ id: org.id, name: org.name, plan: org.plan }));
+          // Use slug as the tenant identifier (X-Tenant-Id header must be the slug, not UUID)
+          const tenantId = org.slug || org.id;
+          setCurrentTenant({ id: tenantId, name: org.name, plan: org.plan as any });
+          localStorage.setItem('current_tenant', JSON.stringify({ id: tenantId, name: org.name, plan: org.plan }));
         })
         .catch(() => { /* ignore — token may be expired */ });
     }

packages/services/billing-service/src/infrastructure/seed/plan-seed.service.ts

@@ -29,7 +29,7 @@ const SEED_PLANS = [
     maxUsers: 20,
     maxStandingOrders: 100,
     hardLimitPercent: 150,
-    trialDays: 14,
+    trialDays: 0,
     isActive: true,
   },
   {
@@ -44,7 +44,7 @@ const SEED_PLANS = [
     maxUsers: -1,
     maxStandingOrders: -1,
     hardLimitPercent: 0, // no hard limit
-    trialDays: 14,
+    trialDays: 0,
     isActive: true,
   },
 ];