完善分发与收集任务全流程

- RestJobEx 对齐 task_id，path_file 提交目录路径
- 运行页进度仅跟接口轮询，失败态停留 page3 UI
- 完成态卡位续做，USB/任务轮询生命周期优化
- 拆分 DLL 加载、任务 staging 与提交前校验
- 移除 mock 与冗余样式，补充 native 依赖

Co-authored-by: Cursor <cursoragent@cursor.com>

app/src/shared/usb-copy-state.ts

@@ -0,0 +1,33 @@
+/** SAPI_GetUsbCopyState: task_status（0=preparing, 1=copying, 2=completed, 3=failed） */
+export const USB_TASK_PREPARING = 0
+export const USB_TASK_COPYING = 1
+export const USB_TASK_COMPLETED = 2
+export const USB_TASK_FAILED = 3
+
+/** @deprecated 使用 USB_TASK_PREPARING */
+export const USB_TASK_IDLE = USB_TASK_PREPARING
+/** @deprecated 使用 USB_TASK_COMPLETED */
+export const USB_TASK_SUCCESS = USB_TASK_COMPLETED
+
+export function clampUsbCopyProgress(value: number): number {
+  return Math.min(100, Math.max(0, Math.round(value)))
+}
+
+export function usbTaskStatusHint(status: number): string {
+  switch (status) {
+    case USB_TASK_PREPARING:
+      return '准备读取数据卡，请确认卡片已插入读卡位'
+    case USB_TASK_COPYING:
+      return '正在从卡片拷贝数据'
+    case USB_TASK_COMPLETED:
+      return '拷贝完成'
+    case USB_TASK_FAILED:
+      return 'USB 收集失败：未检测到卡片存储、读卡失败或无法移动到 USB 读卡位'
+    default:
+      return `USB 任务状态异常 (taskStatus=${status})`
+  }
+}
+
+export function isUsbCopyTerminal(status: number): boolean {
+  return status === USB_TASK_COMPLETED || status === USB_TASK_FAILED
+}