feat(i18n): remaining German comments + CI strings in English

Final residual translations found in code/comments/CI:
- .doorstop.yml: config comments, traceability mapping comments
- Doxyfile: header comment
- tools/render_plantuml.py: docstring
- tools/generate_test_report.py: docstring
- tests/unit_test_framework.h: doxygen brief + body
- tests/unit/test_safety_manager.c: section comment
- src/stubs/*.h: doxygen briefs for diag/display/inclinometer/logger/service/wheel-speed
- .gitea/workflows/release.yml: release notes 'Statische Analyse' + deploy error message

.doorstop.yml

@@ -1,10 +1,10 @@
-# Doorstop-Konfiguration fuer demo-epb
+# Doorstop configuration for demo-epb
 #
-# Bidirektionale Traceability:
-#   SYS-XXX -> SA-XXX  (System-Anforderung wird durch System-Arch abgedeckt)
-#   SA-XXX  -> SWE-XXX (System-Arch verfeinert auf Software-Anforderung)
-#   SWE-XXX -> SWA-XXX (Software-Anforderung wird durch Software-Arch abgedeckt)
-#   SWA-XXX -> Code   (via @arch Tag im Quellcode)
+# Bidirectional traceability:
+#   SYS-XXX -> SA-XXX  (system requirement covered by system arch)
+#   SA-XXX  -> SWE-XXX (system arch refined to software requirement)
+#   SWE-XXX -> SWA-XXX (software requirement covered by software arch)
+#   SWA-XXX -> Code    (via @arch tag in source code)
 
 settings:
   digits: 3