[split-required] Split final 43 files (500-668 LOC) to complete refactoring

klausur-service (11 files):
- cv_gutter_repair, ocr_pipeline_regression, upload_api
- ocr_pipeline_sessions, smart_spell, nru_worksheet_generator
- ocr_pipeline_overlays, mail/aggregator, zeugnis_api
- cv_syllable_detect, self_rag

backend-lehrer (17 files):
- classroom_engine/suggestions, generators/quiz_generator
- worksheets_api, llm_gateway/comparison, state_engine_api
- classroom/models (→ 4 submodules), services/file_processor
- alerts_agent/api/wizard+digests+routes, content_generators/pdf
- classroom/routes/sessions, llm_gateway/inference
- classroom_engine/analytics, auth/keycloak_auth
- alerts_agent/processing/rule_engine, ai_processor/print_versions

agent-core (5 files):
- brain/memory_store, brain/knowledge_graph, brain/context_manager
- orchestrator/supervisor, sessions/session_manager

admin-lehrer (5 components):
- GridOverlay, StepGridReview, DevOpsPipelineSidebar
- DataFlowDiagram, sbom/wizard/page

website (2 files):
- DependencyMap, lehrer/abitur-archiv

Other: nibis_ingestion, grid_detection_service, export-doclayout-onnx

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

backend-lehrer/alerts_agent/api/digests_models.py

@@ -0,0 +1,116 @@
+"""
+Alert Digests - Request/Response Models und Konverter.
+"""
+
+from typing import Optional, List
+from datetime import datetime
+from pydantic import BaseModel, Field
+
+from ..db.models import AlertDigestDB
+
+
+# ============================================================================
+# Request/Response Models
+# ============================================================================
+
+class DigestListItem(BaseModel):
+    """Kurze Digest-Info fuer Liste."""
+    id: str
+    period_start: datetime
+    period_end: datetime
+    total_alerts: int
+    critical_count: int
+    urgent_count: int
+    status: str
+    created_at: datetime
+
+
+class DigestDetail(BaseModel):
+    """Vollstaendige Digest-Details."""
+    id: str
+    subscription_id: Optional[str]
+    user_id: str
+    period_start: datetime
+    period_end: datetime
+    summary_html: str
+    summary_pdf_url: Optional[str]
+    total_alerts: int
+    critical_count: int
+    urgent_count: int
+    important_count: int
+    review_count: int
+    info_count: int
+    status: str
+    sent_at: Optional[datetime]
+    created_at: datetime
+
+
+class DigestListResponse(BaseModel):
+    """Response fuer Digest-Liste."""
+    digests: List[DigestListItem]
+    total: int
+
+
+class GenerateDigestRequest(BaseModel):
+    """Request fuer manuelle Digest-Generierung."""
+    weeks_back: int = Field(default=1, ge=1, le=4, description="Wochen zurueck")
+    force_regenerate: bool = Field(default=False, description="Vorhandenen Digest ueberschreiben")
+
+
+class GenerateDigestResponse(BaseModel):
+    """Response fuer Digest-Generierung."""
+    status: str
+    digest_id: Optional[str]
+    message: str
+
+
+class SendEmailRequest(BaseModel):
+    """Request fuer E-Mail-Versand."""
+    email: Optional[str] = Field(default=None, description="E-Mail-Adresse (optional)")
+
+
+class SendEmailResponse(BaseModel):
+    """Response fuer E-Mail-Versand."""
+    status: str
+    sent_to: str
+    message: str
+
+
+# ============================================================================
+# Converter Functions
+# ============================================================================
+
+def digest_to_list_item(digest: AlertDigestDB) -> DigestListItem:
+    """Konvertiere DB-Model zu List-Item."""
+    return DigestListItem(
+        id=digest.id,
+        period_start=digest.period_start,
+        period_end=digest.period_end,
+        total_alerts=digest.total_alerts or 0,
+        critical_count=digest.critical_count or 0,
+        urgent_count=digest.urgent_count or 0,
+        status=digest.status.value if digest.status else "pending",
+        created_at=digest.created_at
+    )
+
+
+def digest_to_detail(digest: AlertDigestDB) -> DigestDetail:
+    """Konvertiere DB-Model zu Detail."""
+    return DigestDetail(
+        id=digest.id,
+        subscription_id=digest.subscription_id,
+        user_id=digest.user_id,
+        period_start=digest.period_start,
+        period_end=digest.period_end,
+        summary_html=digest.summary_html or "",
+        summary_pdf_url=digest.summary_pdf_url,
+        total_alerts=digest.total_alerts or 0,
+        critical_count=digest.critical_count or 0,
+        urgent_count=digest.urgent_count or 0,
+        important_count=digest.important_count or 0,
+        review_count=digest.review_count or 0,
+        info_count=digest.info_count or 0,
+        status=digest.status.value if digest.status else "pending",
+        sent_at=digest.sent_at,
+        created_at=digest.created_at
+    )