feat: add transmission client

feat: set defaultPath for any system

server/system.ts

@@ -0,0 +1,15 @@
+import fs from 'fs'
+import os from 'os'
+import type { Request, Response } from 'express'
+
+// GET /api/system/info
+export function systemInfo(_req: Request, res: Response): void {
+    const isTermux  = fs.existsSync('/data/data/com.termux')
+    const platform  = os.platform()
+
+    res.json({
+        platform,
+        isTermux,
+        defaultPath: isTermux ? '/sdcard/' : '/',
+    })
+}