E2E Workflow Fixes:
Add frontend dependency installation step (missing npm ci in frontend/)
Remove incorrect working-directory from backend build step
Update Node.js version from v18 to v20 (dependency requirements)
Backend Coverage: 84.9% → 85.0% (20+ new test functions):
Access list service validation and templates
Backup service error handling and edge cases
Security audit logs and rule sets
Auth service edge cases and token validation
Certificate service upload and sync error paths
Frontend Coverage: 85.06% → 85.66% (27 new tests):
Tabs component accessibility and keyboard navigation
Plugins page status badges and error handling
SecurityHeaders CRUD operations and presets
API wrappers for credentials and encryption endpoints
E2E Infrastructure:
Enhanced global-setup with emergency security module reset
Added retry logic and verification for settings propagation
Known Issues:
19 E2E tests still failing (ACL blocking security APIs - Issue #16)
7 Plugins modal UI tests failing (non-critical)
To be addressed in follow-up PR
Fixes#550 E2E workflow failures
Related to #16 ACL implementation
