feat: show draft posts/products on testing and staging

- Add config.showDrafts (true for dev/testing/staging, false for production)
- Replace all isDev checks in blog.ts and products.ts with config.showDrafts
- Previously only NODE_ENV=development showed drafts, missing testing/staging

lib/blog.ts

@@ -59,15 +59,14 @@ export async function getPostBySlug(slug: string, locale: string): Promise<PostD
   try {
     const payload = await getPayload({ config: configPromise });
 
-    const isDev = process.env.NODE_ENV === 'development' || process.env.TARGET === 'staging';
     const { docs } = await payload.find({
       collection: 'posts',
       where: {
         slug: { equals: slug },
-        ...(!isDev ? { _status: { equals: 'published' } } : {}),
+        ...(!config.showDrafts ? { _status: { equals: 'published' } } : {}),
       },
       locale: locale as any,
-      draft: isDev,
+      draft: config.showDrafts,
       limit: 1,
     });
 
@@ -107,15 +106,14 @@ export async function getPostBySlug(slug: string, locale: string): Promise<PostD
 export async function getAllPosts(locale: string): Promise<PostData[]> {
   try {
     const payload = await getPayload({ config: configPromise });
-    const isDev = process.env.NODE_ENV === 'development' || process.env.TARGET === 'staging';
     const { docs } = await payload.find({
       collection: 'posts',
       where: {
-        ...(!isDev ? { _status: { equals: 'published' } } : {}),
+        ...(!config.showDrafts ? { _status: { equals: 'published' } } : {}),
       },
       locale: locale as any,
       sort: '-date',
-      draft: isDev,
+      draft: config.showDrafts,
       limit: 100,
     });