feat: add pioneer medal dto

frontend_nuxt/components/AchievementList.vue

@@ -29,6 +29,7 @@
         <template v-else-if="medal.type === 'CONTRIBUTOR'">
           {{ medal.currentContributionLines }}/{{ medal.targetContributionLines }}
         </template>
+        <template v-else-if="medal.type === 'PIONEER'"> 第{{ medal.rank }}位 </template>
       </div>
     </div>
   </div>

frontend_nuxt/utils/medal.js

@@ -3,6 +3,7 @@ export const medalTitles = {
   POST: '发帖达人',
   SEED: '种子用户',
   CONTRIBUTOR: '贡献者',
+  PIONEER: '开山鼻祖',
 }
 
 export function getMedalTitle(type) {