Fix Seafile API path from /api/v2.1/ to /api2/; v2.0.14

This Seafile instance exposes /api2/ not /api/v2.1/. Updated both the
upload-link call in the host upload route and the dir listing in the
Seafile watcher. Confirmed /api2/ works via node fetch test on the server.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "2.0.13",
+  "version": "2.0.14",
   "type": "module",
   "scripts": {
     "dev": "vite",