feat(search): include user profiles in global search results

Add users group to global search API and frontend types
Query users by display name and link to their public profiles
Update system wordings for the new search group

system-wordings.ts

@@ -90,7 +90,8 @@ export const systemWordingMessages = {
         ancientArtifacts: 'Ancient Artifacts',
         recipes: 'Recipes',
         dailyChecklist: 'Daily CheckList',
-        life: 'Life'
+        life: 'Life',
+        users: 'Users'
       }
     },
     notifications: {
@@ -1409,7 +1410,8 @@ export const systemWordingMessages = {
         ancientArtifacts: 'Ancient Artifacts',
         recipes: '材料单',
         dailyChecklist: '每日 CheckList',
-        life: 'Life'
+        life: 'Life',
+        users: '用户'
       }
     },
     notifications: {