feat(frontend): 增强连接树搜索与资源管理器布局

为连接管理页左侧标签树新增独立搜索能力，支持命中节点、
祖先链路过滤与自动展开，提升大规模连接下的检索效率。

同步优化树头部为资源管理器式布局，并强化节点计数高亮；
补充中英日文案，同时归档并更新 helloagents 记录。

.helloagents/archive/_index.md

@@ -17,6 +17,7 @@
 | 202603252200 | server-status-memory-disk-cards | implementation | frontend, backend | server-status-memory-disk-cards#D001, server-status-memory-disk-cards#D002 | ✅完成 |
 | 202603252207 | ssh-connection-multi-terminal | implementation | frontend | ssh-connection-multi-terminal#D001 | ✅完成 |
 | 202603252220 | connections-tree-toolbar-menu-polish | implementation | frontend | - | ✅完成 |
+| 202603252310 | connections-tree-search-explorer-polish | implementation | frontend | - | ✅完成 |
 | 202603252229 | terminal-tab-group-visual | implementation | frontend | terminal-tab-group-visual#D001 | ✅完成 |
 | 202603252256 | workspace-monitor-terminal-polish | implementation | workspace-root | workspace-monitor-terminal-polish#D001 | ✅完成 |
 | 202603251200 | workspace-workbench-monitor | implementation | frontend, backend | workspace-workbench-monitor#D001 | ✅完成 |
@@ -34,6 +35,7 @@
 - [202603252200_server-status-memory-disk-cards](./2026-03/202603252200_server-status-memory-disk-cards/) - 为服务器状态补齐参考图风格的内存/磁盘卡片，并扩展后端监控字段与磁盘 I/O 速率
 - [202603252207_ssh-connection-multi-terminal](./2026-03/202603252207_ssh-connection-multi-terminal/) - 为同一 SSH 服务器连接补充多终端入口与终端序号标识
 - [202603252220_connections-tree-toolbar-menu-polish](./2026-03/202603252220_connections-tree-toolbar-menu-polish/) - 为连接管理页补树工具栏与展开/收起控制，并整理行内更多菜单
+- [202603252310_connections-tree-search-explorer-polish](./2026-03/202603252310_connections-tree-search-explorer-polish/) - 为连接管理页补左侧树搜索、命中链路过滤、节点计数高亮和资源管理器式头部布局
 - [202603252229_terminal-tab-group-visual](./2026-03/202603252229_terminal-tab-group-visual/) - 将顶部终端标签栏改成更明显的服务器组头与终端子标签
 - [202603252256_workspace-monitor-terminal-polish](./2026-03/202603252256_workspace-monitor-terminal-polish/) - 重新核对状态监控与终端标签剩余改动，并修正知识库归档索引与活跃方案状态
 - [202603251200_workspace-workbench-monitor](./2026-03/202603251200_workspace-workbench-monitor/) - `/workspace` 改为三栏 Workbench 布局，并新增开机累计流量监控