feat(products): add public access to findAll and findAllTags endpoints

feat(ai): enhance AI admin client with status messages for API key configuration
refactor(api): remove authorization check from products route

backend/src/products/products.controller.ts

@@ -13,6 +13,7 @@ import {
   Query,
   Request,
 } from '@nestjs/common';
+import { Public } from '../auth/decorators/public.decorator';
 import { CreateProductDto } from './dto/create-product.dto';
 import { UpdateProductDto } from './dto/update-product.dto';
 import { ProductsService } from './products.service';
@@ -46,6 +47,7 @@ export class ProductsController {
     private readonly categoriesService: CategoriesService,
   ) {}
 
+  @Public()
   @Get()
   findAll(
     @Query('tag') tag?: string,
@@ -54,6 +56,7 @@ export class ProductsController {
     return this.productsService.findAll({ tag, subcategory });
   }
 
+  @Public()
   @Get('tags')
   findAllTags() {
     return this.productsService.findAllTags();