[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>

klausur-service/backend/nru_worksheet_pdf.py

@@ -0,0 +1,31 @@
+"""
+NRU Worksheet PDF — PDF generation using weasyprint.
+
+Extracted from nru_worksheet_generator.py for modularity.
+"""
+
+from typing import List, Dict, Tuple
+
+from nru_worksheet_html import generate_nru_worksheet_html
+
+
+async def generate_nru_pdf(entries: List[Dict], title: str = "Vokabeltest", include_solutions: bool = True) -> Tuple[bytes, bytes]:
+    """
+    Generate NRU worksheet PDFs.
+
+    Returns:
+        Tuple of (worksheet_pdf_bytes, solution_pdf_bytes)
+    """
+    from weasyprint import HTML
+
+    # Generate worksheet HTML
+    worksheet_html = generate_nru_worksheet_html(entries, title, show_solutions=False)
+    worksheet_pdf = HTML(string=worksheet_html).write_pdf()
+
+    # Generate solution HTML
+    solution_pdf = None
+    if include_solutions:
+        solution_html = generate_nru_worksheet_html(entries, title, show_solutions=True)
+        solution_pdf = HTML(string=solution_html).write_pdf()
+
+    return worksheet_pdf, solution_pdf