feat: Wiki 有無判定軽量化（#233） (#234)

#233 Backend が対応できてなかったのでそっちも対応させた．

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #234

frontend/src/types.ts

@@ -48,6 +48,7 @@ export type Tag = {
     name:       string
     category:   Category
     postCount:  number
+    hasWiki:    boolean
     children?:  Tag[] }
 
 export type User = {