feat(billing): start demos on the core plan and apply tariff levels

New signups get the core module set with the 7-day demo. Superadmin can apply core, team, organization, or dedicated and the owner's environments take that level's access.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/platform/platform.controller.ts

@@ -13,6 +13,7 @@ import {
 import { CurrentUser } from '../auth/current-user.decorator';
 import {
   ApplyBillingPlanDto,
+  ApplyProductPlanDto,
   SetStorageQuotaDto,
   SetUserCapDto,
   CreatePlatformAdminDto,
@@ -168,6 +169,11 @@ export class PlatformController {
     return this.platform.setUserCap(id, dto.maxUsers);
   }
 
+  @Post('organizations/:id/product-plan')
+  applyProductPlan(@Param('id') id: string, @Body() dto: ApplyProductPlanDto) {
+    return this.platform.applyProductPlan(id, dto.planCode);
+  }
+
   @Patch('organizations/:id/modules')
   updateOrganizationModules(
     @Param('id') id: string,