fix: rewrite backend hooks, fix invitation flow, align frontend API, fix component naming

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/views/GroupView.vue

@@ -57,7 +57,7 @@ async function refreshMembers() {
 
       <!-- 主内容区 -->
       <main class="main-content">
-        <idle-membersList status="idle" />
+        <IdleMembersList status="idle" />
       </main>
 
       <!-- 右侧边栏 -->
@@ -70,7 +70,7 @@ async function refreshMembers() {
             </div>
           </template>
 
-          <idle-membersList />
+          <IdleMembersList />
         </el-card>
       </aside>
     </div>

frontend/src/views/Home.vue

@@ -110,7 +110,7 @@ function selectGroup(groupId: string) {
             <h3>空闲成员</h3>
           </template>
 
-          <idle-membersList />
+          <IdleMembersList />
         </el-card>
       </aside>
     </div>