[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>

backend-lehrer/alerts_agent/db/__init__.py

@@ -5,16 +5,29 @@ Stellt PostgreSQL-Anbindung für Alert-Persistenz bereit.
 Nutzt die gleiche Base wie classroom_engine für konsistente Migrationen.
 """
 from .database import Base, SessionLocal, get_db, engine
-from .models import (
-    AlertTopicDB,
-    AlertItemDB,
-    AlertRuleDB,
-    AlertProfileDB,
+from .enums import (
     AlertSourceEnum,
     AlertStatusEnum,
     RelevanceDecisionEnum,
     FeedTypeEnum,
     RuleActionEnum,
+    ImportanceLevelEnum,
+    AlertModeEnum,
+    MigrationModeEnum,
+    DigestStatusEnum,
+    UserRoleEnum,
+)
+from .models import (
+    AlertTopicDB,
+    AlertItemDB,
+    AlertRuleDB,
+    AlertProfileDB,
+)
+from .models_dual_mode import (
+    AlertTemplateDB,
+    AlertSourceDB,
+    UserAlertSubscriptionDB,
+    AlertDigestDB,
 )
 
 __all__ = [
@@ -31,4 +44,13 @@ __all__ = [
     "RelevanceDecisionEnum",
     "FeedTypeEnum",
     "RuleActionEnum",
+    "ImportanceLevelEnum",
+    "AlertModeEnum",
+    "MigrationModeEnum",
+    "DigestStatusEnum",
+    "UserRoleEnum",
+    "AlertTemplateDB",
+    "AlertSourceDB",
+    "UserAlertSubscriptionDB",
+    "AlertDigestDB",
 ]