Implement ZMODEM drag-and-drop file upload support in terminal

- Remove outdated SFTP upload message and replace it with ZMODEM-specific messages in English, Russian, and Chinese locales.
- Add a new function to handle ZMODEM drag-and-drop uploads in the terminal backend.
- Update terminal components to support ZMODEM drag-and-drop functionality.
- Enhance error handling for file uploads and provide user feedback for no files to upload.
- Introduce tests to verify ZMODEM upload behavior and fallback to SFTP for network devices.

types/global/netcatty-bridge-session.d.ts

@@ -229,6 +229,16 @@ declare global {
       }) => void
     ): () => void;
     cancelZmodem?(sessionId: string): void;
+    startZmodemDragDropUpload?(
+      sessionId: string,
+      files: Array<{
+        path?: string;
+        name: string;
+        remoteName: string;
+        data?: ArrayBuffer;
+      }>,
+      uploadCommand?: string,
+    ): Promise<{ success: boolean; error?: string }>;
     onZmodemOverwriteRequest?(
       sessionId: string,
       cb: (payload: { sessionId: string; requestId: string; filename: string }) => void