feat(i18n): tools + landing page + doorstop generator in English

Phase 1 of full English translation:
- generate_doorstop_items.py: all 55 items (SG/SYS/SWE/SA/SWA) rewritten in English
- generate_landing_page.py: full UI labels, KPI cards, section headings in English
- traceability.py: docstring, error messages, HTML headers in English
- generate_test_report.py: report content + table headers in English
- All 55 markdown items in safety/sg/, reqs/, arch/ regenerated in English

Still to come:
- demo-epb filled Word docs (PID, plans, safety, manuals, audit artefacts)
- Code comments + test names + CI workflow step names
- README + dev-process repo templates

arch/swe/SWA-009.md

@@ -13,7 +13,8 @@ asil: QM
 
 # SWA-009: Service Mode
 
-## Verantwortung
+## Responsibility
 
-Service-Modus fuer Werkstatt. Wird ueber UDS RoutineControl 0x31, Routine-ID
-0x0301 aktiviert. Steuert Aktoren in Wartungsposition.
+Service mode for the workshop. Activated via UDS RoutineControl
+0x31, routine ID 0x0301. Drives the actuators into maintenance
+position.