refactor: 优化智能分页 DOM 检测机制并添加密钥名称复制功能

- useSmartPagination 使用 ResizeObserver 替代 nextTick 确保 DOM 稳定后检测
- 添加防抖机制避免频繁触发检测
- 组件卸载时清理 ResizeObserver 资源
- ProviderDetailDrawer 密钥名称支持点击复制

frontend/src/features/providers/components/ProviderDetailDrawer.vue

@@ -234,7 +234,11 @@
                         </div>
                         <div class="flex flex-col min-w-0">
                           <div class="flex items-center gap-1.5">
-                            <span class="text-sm font-medium truncate">{{ key.name || '未命名密钥' }}</span>
+                            <span
+                              class="text-sm font-medium truncate cursor-pointer hover:text-primary transition-colors"
+                              title="点击复制"
+                              @click.stop="copyToClipboard(key.name || '未命名密钥')"
+                            >{{ key.name || '未命名密钥' }}</span>
                             <!-- OAuth 订阅类型标签 (Codex) -->
                             <Badge
                               v-if="key.oauth_plan_type"