Update version number to 2.0.6 across codebase

- Fix version inconsistencies in server.js API status endpoint
- Update User-Agent string in RSS feed manager
- Update version in config file templates
- Update dashboard display with version 2.0.6
- Add version 2.0.6 to version history with changelog

🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>

scripts/update.sh

@@ -81,4 +81,4 @@ fi
 # Update complete
 echo -e "${GREEN}${BOLD}Update complete!${NC}"
 echo -e "Updated from version $CURRENT_VERSION to $NEW_VERSION"
-echo -e "Changes will take effect immediately."
+echo -e "Changes will take effect immediately."