feat: optimize release workflow for better distribution

- Configure GitHub Actions to generate platform-specific releases:
  - macOS: zip package only (avoids signing issues)
  - Windows: installer (NSIS) and portable version
  - Linux: AppImage and deb packages
- Update Tauri config to build all available targets
- Add documentation for macOS signature workarounds

src-tauri/tauri.conf.json

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