fix: fake update detection, Hermes web mode commands, cleanup hot update

1. 假更新检测: checkNewVersion 对比 Tauri 二进制版本与前端版本，
   若前端版本 > 二进制版本（热更新导致），提示用户下载完整安装包
2. 版本统一: sidebar 和 about 页面均使用 __APP_VERSION__
3. 更新机制: checkHotUpdate → checkNewVersion，改用 GitHub Releases API，
   移除 check_frontend_update / download / rollback / get_update_status 死代码
4. Hermes Web 模式: dev-api.js 实现全部 15 个 Hermes 命令处理器
   (check_python, check_hermes, install_hermes, configure_hermes,
    hermes_gateway_action, hermes_health_check, hermes_api_proxy,
    hermes_agent_run, hermes_read_config, hermes_fetch_models,
    hermes_update_model, hermes_detect_environments, hermes_set_gateway_url,
    update_hermes, uninstall_hermes)
5. i18n: 新增 versionMismatch, hotUpdateDeprecated, downloadFullInstaller

src/components/sidebar.js

@@ -6,7 +6,7 @@ import { toggleTheme, getTheme } from '../lib/theme.js'
 import { isOpenclawReady } from '../lib/app-state.js'
 import { api } from '../lib/tauri-api.js'
 import { toast } from './toast.js'
-import { version as APP_VERSION } from '../../package.json'
+const APP_VERSION = typeof __APP_VERSION__ !== 'undefined' ? __APP_VERSION__ : '0.0.0'
 import { t, getLang, setLang, getAvailableLangs } from '../lib/i18n.js'
 import { isFeatureAvailable } from '../lib/feature-gates.js'
 import { getActiveEngine, getActiveEngineId, listEngines, switchEngine, onEngineChange } from '../lib/engine-manager.js'