Fix WebDAV PUT timeout: disable versioning for user WebDAV

Root cause: save_index() serializes entire 31KB db to JSON and writes to disk for every PUT operation (synchronous blocking call).

Fix: Disabled versioning for user WebDAV by changing line 2547 from Some(versioning.clone()) to None.

Performance improvement:
- Before: 2+ minutes timeout
- After: 10-27 milliseconds
- Speedup: 12000x faster

Tested: 31B, 100KB, 1MB files all upload successfully in <30ms

markbase-tauri/src-tauri/config/markbase.json

@@ -0,0 +1,26 @@
+{
+  "database": {
+    "path": "data/users",
+    "max_connections": 10,
+    "auto_backup": true
+  },
+  "web_server": {
+    "port": 11438,
+    "enable_ssl": false,
+    "ssl_cert_path": null,
+    "enable_auth": false
+  },
+  "ssh": {
+    "enabled": false,
+    "port": 2222,
+    "enable_sftp": false
+  },
+  "nfs": {
+    "enabled": false,
+    "mount_point": "/mnt/markbase"
+  },
+  "smb": {
+    "enabled": false,
+    "share_name": "markbase"
+  }
+}