fix(engine-select): release 0.16.4

src/lib/humanize-error.js

@@ -26,7 +26,7 @@ const PATTERNS = [
   // 网络
   {
     key: 'network',
-    re: /(failed to fetch|networkerror|networkfailure|enetunreach|econnreset|econnrefused|ehostunreach|err_network|fetch failed|connection refused|connection reset|getaddrinfo|dns error|no route to host|aborted|broken pipe|connect timed out|tcp connect)/i,
+    re: /(failed to fetch|networkerror|networkfailure|enetunreach|econnreset|econnrefused|ehostunreach|err_network|fetch failed|connection refused|connection reset|getaddrinfo|dns error|no route to host|aborted|broken pipe|connect timed out|tcp connect|backend service is not running|web deployment mode|后端服务未运行)/i,
   },
   // Gateway 未启动（特殊的 connection refused / port not listen 情况）
   {

src/lib/tauri-api.js

@@ -231,7 +231,13 @@ export async function checkBackendHealth() {
   if (isTauriRuntime()) { _setBackendOnline(true); return true }
   try {
     const resp = await fetch('/__api/health', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: '{}' })
-    const ok = resp.ok
+    const ct = (resp.headers.get('content-type') || '').toLowerCase()
+    if (!resp.ok || !ct.includes('application/json')) {
+      _setBackendOnline(false)
+      return false
+    }
+    const data = await resp.json().catch(() => null)
+    const ok = !!data?.ok
     _setBackendOnline(ok)
     return ok
   } catch {

src/main.js

@@ -110,7 +110,7 @@ function showBackendDownOverlay() {
         <div style="color:var(--text-tertiary);margin-bottom:4px"># ${t('common.devMode')}</div>
         npm run dev<br>
         <div style="color:var(--text-tertiary);margin-top:8px;margin-bottom:4px"># ${t('common.prodMode')}</div>
-        npm run preview
+        npm run serve
       </div>
       <button class="login-btn" id="btn-backend-retry" style="margin-top:8px">
         <span id="backend-retry-text">${t('common.checkAgain')}</span>

src/pages/engine-select.js

@@ -2,6 +2,7 @@ import { navigate } from '../router.js'
 import { t } from '../lib/i18n.js'
 import { applyEngineSelection } from '../lib/engine-manager.js'
 import { toast } from '../components/toast.js'
+import { humanizeError } from '../lib/humanize-error.js'
 
 const PRIMARY_OPTIONS = [
   {
@@ -167,7 +168,7 @@ function bindClick(page) {
         navigate(option.targetRoute)
       } catch (error) {
         console.error('[engine-select] secondary choose failed:', error)
-        toast(t('engine.choiceSaveFailed'), 'error')
+        toast(humanizeError(error, t('engine.choiceSaveFailed')), 'error')
         _busy = false
         btn.classList.remove('loading')
       }
@@ -213,7 +214,7 @@ async function chooseWithAnimation(page, panel, option, engine) {
       }, 280))
     } catch (error) {
       console.error('[engine-select] choose failed:', error)
-      toast(t('engine.choiceSaveFailed'), 'error')
+      toast(humanizeError(error, t('engine.choiceSaveFailed')), 'error')
       // 失败回退：移除动画层 + 解除 busy
       removeRevealNodes()
       // stage 可能已不在 DOM（路由已切走）— 防御性访问