perf(e2e): CI smoke test 改 retain-on-failure 降低錄影 overhead

video/screenshot 從 'on' 改為 retain-on-failure/only-on-failure
CI 遠端 smoke test 預計從 13min+ 降至 ~1min

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/playwright.config.ts

@@ -33,8 +33,9 @@ export default defineConfig({
     ignoreHTTPSErrors: true,
 
     // 截圖與錄影 - 統帥強制要求
-    screenshot: 'on',
-    video: 'on',
+    // 2026-04-16 ogt: CI 遠端 smoke test 改為 retain-on-failure，避免錄影拖慢 13min+ → ~1min
+    screenshot: isRemote ? 'only-on-failure' : 'on',
+    video: isRemote ? 'retain-on-failure' : 'on',
     trace: 'on-first-retry',
 
     // Viewport - Wave 4: deviceScaleFactor 固定為 1 (Visual Baseline 一致性)