[split-required] Split remaining 500-680 LOC files (final batch)

website (17 pages + 3 components):
- multiplayer/wizard, middleware/wizard+test-wizard, communication
- builds/wizard, staff-search, voice, sbom/wizard
- foerderantrag, mail/tasks, tools/communication, sbom
- compliance/evidence, uni-crawler, brandbook (already done)
- CollectionsTab, IngestionTab, RiskHeatmap

backend-lehrer (5 files):
- letters_api (641 → 2), certificates_api (636 → 2)
- alerts_agent/db/models (636 → 3)
- llm_gateway/communication_service (614 → 2)
- game/database already done in prior batch

klausur-service (2 files):
- hybrid_vocab_extractor (664 → 2)
- klausur-service/frontend: api.ts (620 → 3), EHUploadWizard (591 → 2)

voice-service (3 files):
- bqas/rag_judge (618 → 3), runner (529 → 2)
- enhanced_task_orchestrator (519 → 2)

studio-v2 (6 files):
- korrektur/[klausurId] (578 → 4), fairness (569 → 2)
- AlertsWizard (552 → 2), OnboardingWizard (513 → 2)
- korrektur/api.ts (506 → 3), geo-lernwelt (501 → 2)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

website/app/admin/rag/components/index.ts

@@ -2,7 +2,8 @@
  * RAG Admin Page Components
  */
 
-export { CollectionsTab, CollectionCard } from './CollectionsTab'
+export { CollectionsTab } from './CollectionsTab'
+export { CollectionCard } from './CollectionCard'
 export { UploadTab } from './UploadTab'
 export { IngestionTab } from './IngestionTab'
 export { DocumentsTab } from './DocumentsTab'