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Port conflict validation: - api/port_registry.py: detect_conflicts() checks all service sections for shared port values - api/app.py: returns HTTP 409 on port conflict after existing range validation - webui/src/pages/Settings.jsx: JS-side detectPortConflicts() with useMemo shows inline conflict errors and blocks Save before the request is made; catch blocks surface server error messages (including 409) instead of generic fallbacks Config autosave on Apply: - webui/src/contexts/DraftConfigContext.jsx: new context; Settings registers flush callbacks per section; App calls flushAll() before applyPending() when any section is dirty - webui/src/App.jsx: wraps tree with DraftConfigProvider, handleApply shows 'saving' banner state and awaits flushAll() - webui/src/pages/Settings.jsx: registers identity + per-service flushers; propagates dirty state into context via setDirty; uses refs to avoid stale closures Extended integration test coverage (114 new tests): - tests/integration/test_config_api.py: GET/PUT config, export, import, backup lifecycle - tests/integration/test_network_services.py: DNS records + DHCP reservations CRUD - tests/integration/test_containers.py: list, restart, logs, stats; recovery polling - tests/integration/test_negative_scenarios.py: error-path coverage for all endpoints - tests/test_port_conflicts.py: 20 unit tests for port_registry.detect_conflicts() Pre-commit hook updated to skip tests/integration/ (live-stack tests require a running stack and must be run explicitly via `make test-integration`). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>