Bump version to 1.0.5 and update installation instructions

- Update version to 1.0.5 in all package files and build script
- Add double-click .dxt installation as recommended option in README
- Keep npx option as alternative installation method

🤖 Generated with [Claude Code](https://claude.ai/code)

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

opendia-extension/manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "OpenDia",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "description": "Browser automation through Model Context Protocol",
   "icons": {
     "16": "icon-16.png",