chore: update cache key if no authors and update commentEmbed type

Author: jonathanyeong

server/api/atproto/author-profiles.get.ts

@@ -81,7 +81,7 @@ export default defineCachedEventHandler(
     maxAge: CACHE_MAX_AGE_ONE_DAY,
     getKey: event => {
       const { authors } = getQuery(event)
-      return `author-profiles:${authors}`
+      return `author-profiles:${authors ?? ''}`
     },
   },
 )

shared/types/blog-post.ts

@@ -4,11 +4,10 @@ import type {
   AppBskyEmbedImages,
   AppBskyEmbedExternal,
 } from '@atproto/api'
-export interface CommentEmbed {
-  type: 'images' | 'external'
-  images?: AppBskyEmbedImages.ViewImage[]
-  external?: AppBskyEmbedExternal.ViewExternal
-}
+
+export type CommentEmbed =
+  | { type: 'images'; images: AppBskyEmbedImages.ViewImage[] }
+  | { type: 'external'; external: AppBskyEmbedExternal.ViewExternal }
 
 export interface Comment {
   uri: string