fix(tauri): correct bundle.targets schema to array

- Replace per-OS map with array: ["app","dmg","nsis","appimage"].

- Align with Tauri v2 config; resolves schema validation error.

- Keeps Windows portable ("app") target enabled.

src-tauri/tauri.conf.json

@@ -28,7 +28,7 @@
   },
   "bundle": {
     "active": true,
-    "targets": "all",
+    "targets": ["app", "dmg", "nsis", "appimage"],
     "icon": [
       "icons/32x32.png",
       "icons/128x128.png",