feat: complete admin panel and backend admin api migration

apps/api/src/modules/pricing/pricing.controller.ts

@@ -1,6 +1,8 @@
 import { Controller, Get, Query } from '@nestjs/common';
 import { PricingService } from './pricing.service';
+import { Public } from '../auth/guards';
 
+@Public() // pre-existing unauthenticated endpoint; see Phase 1 notes
 @Controller('pricing')
 export class PricingController {
   constructor(private readonly pricing: PricingService) {}