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-002.md

@@ -16,12 +16,13 @@ asil: D
 
 # SWA-002: Apply Controller
 
-## Verantwortung
+## Responsibility
 
-Zentraler Controller fuer Apply, Hold und Release der Parkbremse.
-ASIL-D-Kern der EPB-Software. Implementiert in `src/apply_controller.c`.
+Central controller for apply, hold and release of the parking brake.
+ASIL-D core of the EPB software. Implemented in
+`src/apply_controller.c`.
 
-## Statische Sicht
+## Static view
 
 ```plantuml
 @startuml
@@ -34,7 +35,7 @@ ASIL-D-Kern der EPB-Software. Implementiert in `src/apply_controller.c`.
 @enduml
 ```
 
-## Schnittstellen (Provided)
+## Provided interfaces
 
 ```c
 Status apply_ctrl_init(void);
@@ -42,7 +43,7 @@ void   apply_ctrl_step_50ms(const ApplyInputs* in);
 EpbStatus apply_ctrl_get_status(void);
 ```
 
-## Dynamisches Verhalten
+## Dynamic behaviour
 
 ```plantuml
 @startuml
@@ -58,24 +59,24 @@ Error --> Released : reset & no fault
 @enduml
 ```
 
-## Ressourcen
+## Resources
 
 - Stack: <= 384 B
-- Worst-Case Timing: 350 us / Aufruf
+- Worst-case timing: 350 us per call
 
-## Designentscheidungen
+## Design decisions
 
-| Entscheidung | Begruendung |
-|--------------|-------------|
-| Statische Allokation, kein Heap | Determinismus, MISRA C 21.3 |
-| State Machine | Einfacher zu verifizieren, deterministisch |
-| 50ms Step-Funktion | Synchron zur Inclinometer-Abtastung |
+| Decision | Rationale |
+|----------|-----------|
+| Static allocation, no heap | Determinism, MISRA C 21.3 |
+| State machine | Easier to verify, deterministic |
+| 50 ms step function | Synchronous with inclinometer sample rate |
 
-## Mapping auf Anforderungen
+## Mapping to requirements
 
-| Anforderung | Wie abgedeckt |
-|-------------|---------------|
-| SWE-001 | Hold-Zustand mit periodischer Klemmkraft-Pruefung |
-| SWE-002 | Watchdog-Pet im step_50ms |
-| SWE-003 | sw_apply Input wird sofort ausgewertet |
-| SWE-004 | Current-Target-Detektion via Actuator-Driver-Feedback |
+| Requirement | How covered |
+|-------------|-------------|
+| SWE-001 | Hold state with periodic clamping-force check |
+| SWE-002 | Watchdog pet in step_50ms |
+| SWE-003 | sw_apply input is evaluated immediately |
+| SWE-004 | current-target detection via actuator-driver feedback |