feat(reporting+docs): tenant-ID-Validierung, Go-Tests, 4 MkDocs-Einzelseiten

- reporting_handlers.go: uuid.Nil-Check vor Store-Aufruf (→ 400)
- reporting_handlers_test.go: 4 MissingTenantID-Tests (PASS) + 4 WithTenant-Tests (SKIP)
- docs-src: requirements.md, controls.md, evidence.md, risks.md (je mit API, Schema, Tests)
- mkdocs.yml: 4 neue Nav-Einträge + \n-Bug auf Zeile 91 behoben
- compliance-kern.md: Link-Hinweise zu Detailseiten ergänzt

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

mkdocs.yml

@@ -68,6 +68,10 @@ nav:
       - Vorbereitung-Module (Paket 1): services/sdk-modules/vorbereitung-module.md
       - Freigabe-Module (Paket 2): services/sdk-modules/freigabe-module.md
       - Compliance-Kern-Module (Paket 3): services/sdk-modules/compliance-kern.md
+      - Anforderungen (CP-ANF): services/sdk-modules/requirements.md
+      - Controls (CP-CTR): services/sdk-modules/controls.md
+      - Nachweise/Evidence (CP-NAC): services/sdk-modules/evidence.md
+      - Risiken (CP-RSK): services/sdk-modules/risks.md
       - Analyse-Module (Paket 2): services/sdk-modules/analyse-module.md
       - Dokumentations-Module (Paket 3+): services/sdk-modules/dokumentations-module.md
       - DSFA (Art. 35 DSGVO): services/sdk-modules/dsfa.md
@@ -84,7 +88,8 @@ nav:
       - Document Crawler: services/sdk-modules/document-crawler.md
       - Advisory Board: services/sdk-modules/advisory-board.md
       - DSB Portal: services/sdk-modules/dsb-portal.md
-      - Industry Compliance Ingestion: services/sdk-modules/industry-compliance-ingestion.md\n      - IACE (CE-Risikobeurteilung): services/sdk-modules/iace.md
+      - Industry Compliance Ingestion: services/sdk-modules/industry-compliance-ingestion.md
+      - IACE (CE-Risikobeurteilung): services/sdk-modules/iace.md
   - Entwicklung:
     - Testing: development/testing.md
     - Dokumentation: development/documentation.md