feat(v1.1): Toast通知系统 + 自定义对话框 + 终端搜索 + SFTP真实实现 + 标签持久化

任务7: Toast通知系统 — ToastProvider+4类型(success/error/warning/info)+右上角堆叠动画
任务8: 替换alert/confirm/prompt — ConfirmDialog+PromptDialog+useToast替换7处原生对话框
任务9: 终端搜索 — xterm SearchAddon Ctrl+F搜索栏(上一个/下一个/关闭)
任务10: SFTP上传/删除 — useSFTP.ts upload/delete方法实现
任务11: 会话恢复 — tabStore持久化到localStorage,启动恢复tabs

14 files changed, 1218 insertions(+), 241 deletions(-)

package-lock.json

@@ -10,6 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "@xterm/addon-fit": "^0.10.0",
+        "@xterm/addon-search": "^0.16.0",
         "@xterm/xterm": "^5.5.0",
         "lucide-react": "^0.294.0",
         "react": "^18.2.0",
@@ -3167,6 +3168,12 @@
         "@xterm/xterm": "^5.0.0"
       }
     },
+    "node_modules/@xterm/addon-search": {
+      "version": "0.16.0",
+      "resolved": "https://registry.npmmirror.com/@xterm/addon-search/-/addon-search-0.16.0.tgz",
+      "integrity": "sha512-9OeuBFu0/uZJPu+9AHKY6g/w0Czyb/Ut0A5t79I4ULoU4IfU5BEpPFVGQxP4zTTMdfZEYkVIRYbHBX1xWwjeSA==",
+      "license": "MIT"
+    },
     "node_modules/@xterm/addon-webgl": {
       "version": "0.19.0",
       "resolved": "https://registry.npmmirror.com/@xterm/addon-webgl/-/addon-webgl-0.19.0.tgz",