feat(ci): Daily E2E Health 改用 VIP 端點

- 將 API URL 從 192.168.0.120:32334 改為 192.168.0.125:32334
- 使用 keepalived VIP 取代直連單節點
- 提升 CI/CD 高可用性

Ref: ADR-033 Phase K-NET

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/daily-e2e-health.yaml

@@ -24,7 +24,7 @@ on:
       api_url:
         description: 'API URL to test'
         required: false
-        default: 'http://192.168.0.120:32334'
+        default: 'http://192.168.0.125:32334'
       dry_run:
         description: 'Dry run mode (skip actual approval)'
         required: false
@@ -40,7 +40,7 @@ concurrency:
 
 env:
   PYTHON_VERSION: '3.11'
-  DEFAULT_API_URL: http://192.168.0.120:32334
+  DEFAULT_API_URL: http://192.168.0.125:32334
 
 jobs:
   e2e-health-check: