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。

packages/frontend/src/locales/en-US.json

@@ -364,6 +364,11 @@
     "status": {
       "never": "Never"
     },
+    "scopeExplorerTitle": "Tag Explorer",
+    "scopeHintCompact": "Tree nodes are grouped by tag path",
+    "scopeTreeSearch": "Search tag tree...",
+    "scopeSearchMode": "Matched paths are expanded",
+    "scopeTreeNoMatch": "No matching tree nodes",
     "untaggedGroup": "Untagged",
     "noUntaggedConnections": "No untagged connections found."
   },
@@ -1097,6 +1102,9 @@
     "height": "Height",
     "reconnect": "Reconnect",
     "retry": "Retry",
+    "reset": "Reset",
+    "expandAll": "Expand All",
+    "collapseAll": "Collapse All",
     "sortAscending": "Ascending",
     "sortDescending": "Descending",
     "restore": "Restore",

packages/frontend/src/locales/ja-JP.json

@@ -100,6 +100,9 @@
         "reconnect": "再接続",
         "remove": "削除",
         "retry": "再試行",
+        "reset": "リセット",
+        "expandAll": "すべて展開",
+        "collapseAll": "すべて折りたたむ",
         "save": "保存",
         "saving": "保存中...",
         "saved": "保存済み",
@@ -265,6 +268,11 @@
         "status": {
             "never": "なし"
         },
+        "scopeExplorerTitle": "タグエクスプローラー",
+        "scopeHintCompact": "ツリーノードはタグパスごとに整理されます",
+        "scopeTreeSearch": "タグツリーを検索...",
+        "scopeSearchMode": "一致したパスを自動展開中",
+        "scopeTreeNoMatch": "一致するツリーノードはありません",
         "table": {
             "actions": "アクション",
             "authMethod": "認証方法",

packages/frontend/src/locales/zh-CN.json

@@ -364,6 +364,11 @@
     "status": {
       "never": "从未"
     },
+    "scopeExplorerTitle": "标签资源管理器",
+    "scopeHintCompact": "树节点按标签路径自动分层",
+    "scopeTreeSearch": "搜索标签树...",
+    "scopeSearchMode": "命中路径已自动展开",
+    "scopeTreeNoMatch": "没有匹配的树节点",
     "untaggedGroup": "未标记",
     "noUntaggedConnections": "没有未标记的连接。"
   },
@@ -1094,6 +1099,9 @@
     "height": "高度",
     "reconnect": "重新连接",
     "retry": "重试",
+    "reset": "重置",
+    "expandAll": "展开全部",
+    "collapseAll": "收起全部",
     "sortAscending": "升序",
     "sortDescending": "降序",
     "restore": "还原",