[split-required] Split 700-870 LOC files across all services

backend-lehrer (11 files):
- llm_gateway/routes/schools.py (867 → 5), recording_api.py (848 → 6)
- messenger_api.py (840 → 5), print_generator.py (824 → 5)
- unit_analytics_api.py (751 → 5), classroom/routes/context.py (726 → 4)
- llm_gateway/routes/edu_search_seeds.py (710 → 4)

klausur-service (12 files):
- ocr_labeling_api.py (845 → 4), metrics_db.py (833 → 4)
- legal_corpus_api.py (790 → 4), page_crop.py (758 → 3)
- mail/ai_service.py (747 → 4), github_crawler.py (767 → 3)
- trocr_service.py (730 → 4), full_compliance_pipeline.py (723 → 4)
- dsfa_rag_api.py (715 → 4), ocr_pipeline_auto.py (705 → 4)

website (6 pages):
- audit-checklist (867 → 8), content (806 → 6)
- screen-flow (790 → 4), scraper (789 → 5)
- zeugnisse (776 → 5), modules (745 → 4)

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

.claude/rules/loc-exceptions.txt

@@ -39,6 +39,9 @@
 **/lib/sdk/vvt-baseline-catalog.ts | owner=admin-lehrer | reason=Pure data catalog (630 LOC, BaselineTemplate[] literals) | review=2027-01-01
 **/lib/sdk/loeschfristen-baseline-catalog.ts | owner=admin-lehrer | reason=Pure data catalog (578 LOC, retention period templates) | review=2027-01-01
 
+# Single SSE generator orchestrating 6 pipeline steps — cannot split generator context
+**/ocr_pipeline_auto_steps.py | owner=klausur | reason=run_auto is a single async generator yielding SSE events across 6 steps (528 LOC) | review=2026-10-01
+
 # Legacy — TEMPORAER bis Refactoring abgeschlossen
 # Dateien hier werden Phase fuer Phase abgearbeitet und entfernt.
 # KEINE neuen Ausnahmen ohne [guardrail-change] Commit-Marker!