feat: Vollstaendige Demo-Doku — Safety, Manuals, Reports, API-Doc

Neue Word-Dokumente (alle aus Markdown via pandoc):

Safety (docs/safety/):
- HARA.docx — Hazard Analysis & Risk Assessment, leitet ASIL-D ab
- Safety-Case.docx — Argumentation pro Safety Goal (GSN-Stil)
- FMEDA.docx — Pro-Komponente Failure Modes + Diagnostic Coverage
- MISRA-Compliance-Statement.docx — formaler MISRA-Nachweis
- Verification-Report.docx — V-Modell rechte Seite Zusammenfassung
- Tool-Qualification-Cppcheck.docx — Tool-Qual (TCL2/ASIL-D)

Manuals (docs/manuals/):
- User-Manual.docx — Fahrerhandbuch-Auszug
- Service-Manual.docx — Werkstatt-Doku mit UDS-DTCs

CI-Erweiterungen:
- Doxyfile + `make docs` — API-Dokumentation aus src/
- tools/generate_test_report.py + `make test-report` — Test-Summary HTML
- validate.yml: Doxygen + Test-Report als CI-Artefakte
- release.yml: alle Word-Docs + Engineering-Artefakte ins Release-Bundle

README:
- Komplette Tour durch alle Artefakte
- Repo-Struktur-Diagramm aktualisiert

Doxyfile

@@ -0,0 +1,80 @@
+# Minimal Doxygen-Konfiguration fuer demo-epb
+# Generiert HTML-API-Dokumentation aus src/
+
+PROJECT_NAME           = "demo-epb"
+PROJECT_BRIEF          = "Elektrische Parkbremse - slohmaier Dev Process Demo"
+PROJECT_NUMBER         = "v1.0"
+OUTPUT_DIRECTORY       = build/api-doc
+CREATE_SUBDIRS         = NO
+OUTPUT_LANGUAGE        = German
+BRIEF_MEMBER_DESC      = YES
+REPEAT_BRIEF           = YES
+ALWAYS_DETAILED_SEC    = YES
+INLINE_INHERITED_MEMB  = NO
+FULL_PATH_NAMES        = NO
+SHORT_NAMES            = NO
+JAVADOC_AUTOBRIEF      = YES
+QT_AUTOBRIEF           = NO
+INHERIT_DOCS           = YES
+SEPARATE_MEMBER_PAGES  = NO
+TAB_SIZE               = 4
+OPTIMIZE_OUTPUT_FOR_C  = YES
+EXTRACT_ALL            = YES
+EXTRACT_PRIVATE        = YES
+EXTRACT_STATIC         = YES
+EXTRACT_LOCAL_CLASSES  = YES
+HIDE_UNDOC_MEMBERS     = NO
+HIDE_UNDOC_CLASSES     = NO
+HIDE_FRIEND_COMPOUNDS  = NO
+HIDE_IN_BODY_DOCS      = NO
+INTERNAL_DOCS          = YES
+CASE_SENSE_NAMES       = YES
+SORT_BRIEF_DOCS        = NO
+SORT_BY_SCOPE_NAME     = NO
+GENERATE_TODOLIST      = YES
+GENERATE_TESTLIST      = YES
+GENERATE_BUGLIST       = YES
+GENERATE_DEPRECATEDLIST= YES
+SHOW_USED_FILES        = YES
+SHOW_FILES             = YES
+SHOW_NAMESPACES        = YES
+QUIET                  = YES
+WARNINGS               = YES
+WARN_IF_UNDOCUMENTED   = NO
+INPUT                  = src/ src/stubs/
+RECURSIVE              = YES
+FILE_PATTERNS          = *.c *.h
+EXCLUDE_PATTERNS       = */build/* */tests/*
+SOURCE_BROWSER         = YES
+INLINE_SOURCES         = NO
+STRIP_CODE_COMMENTS    = NO
+REFERENCED_BY_RELATION = YES
+REFERENCES_RELATION    = YES
+REFERENCES_LINK_SOURCE = YES
+USE_HTAGS              = NO
+VERBATIM_HEADERS       = YES
+ALPHABETICAL_INDEX     = YES
+GENERATE_HTML          = YES
+HTML_OUTPUT            = html
+HTML_FILE_EXTENSION    = .html
+HTML_DYNAMIC_MENUS     = YES
+HTML_DYNAMIC_SECTIONS  = NO
+HTML_INDEX_NUM_ENTRIES = 100
+DISABLE_INDEX          = NO
+GENERATE_TREEVIEW      = YES
+ENUM_VALUES_PER_LINE   = 4
+TREEVIEW_WIDTH         = 250
+EXT_LINKS_IN_WINDOW    = NO
+HTML_FORMULA_FORMAT    = png
+FORMULA_FONTSIZE       = 10
+GENERATE_LATEX         = NO
+GENERATE_RTF           = NO
+GENERATE_MAN           = NO
+GENERATE_XML           = NO
+ENABLE_PREPROCESSING   = YES
+MACRO_EXPANSION        = NO
+SEARCH_INCLUDES        = YES
+HAVE_DOT               = NO
+ALIASES                = "arch=@par Architecture-Element:^^" \
+                         "reqs=@par Requirements:^^" \
+                         "asil=@par ASIL Klassifikation:^^"