feat(remote): 实现文件上传真实进度显示

- 使用分块上传替代一次性上传
- 调用 /upload/start → /upload/chunk → /upload/merge 接口
- 通过 IPC 事件实时推送上传进度到前端
- 修复 merge 时未使用目标路径的问题

src/modules/remote/api.ts

@@ -102,11 +102,28 @@ export const uploadFileToRemote = async (
   password?: string,
   onProgress?: (progress: number) => void
 ): Promise<void> => {
-  onProgress?.(50)
-  const result = await window.electronAPI.remoteUploadFile(serverHost, port, filePath, remotePath, password)
-  onProgress?.(100)
-  if (!result.success) {
-    throw new Error(result.error || 'Upload failed')
+  const transferId = Date.now().toString()
+
+  const cleanup = window.electronAPI?.onUploadProgress?.((data) => {
+    if (data.id === transferId) {
+      onProgress?.(data.progress)
+    }
+  })
+
+  try {
+    const result = await window.electronAPI.remoteUploadFile(
+      transferId,
+      serverHost,
+      port,
+      filePath,
+      remotePath,
+      password
+    )
+    if (!result.success) {
+      throw new Error(result.error || 'Upload failed')
+    }
+  } finally {
+    cleanup?.()
   }
 }