[split-required] Split 500-850 LOC files (batch 2)

backend-lehrer (10 files):
- game/database.py (785 → 5), correction_api.py (683 → 4)
- classroom_engine/antizipation.py (676 → 5)
- llm_gateway schools/edu_search already done in prior batch

klausur-service (12 files):
- orientation_crop_api.py (694 → 5), pdf_export.py (677 → 4)
- zeugnis_crawler.py (676 → 5), grid_editor_api.py (671 → 5)
- eh_templates.py (658 → 5), mail/api.py (651 → 5)
- qdrant_service.py (638 → 5), training_api.py (625 → 4)

website (6 pages):
- middleware (696 → 8), mail (733 → 6), consent (628 → 8)
- compliance/risks (622 → 5), export (502 → 5), brandbook (629 → 7)

studio-v2 (3 components):
- B2BMigrationWizard (848 → 3), CleanupPanel (765 → 2)
- dashboard-experimental (739 → 2)

admin-lehrer (4 files):
- uebersetzungen (769 → 4), manager (670 → 2)
- ChunkBrowserQA (675 → 6), dsfa/page (674 → 5)

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

admin-lehrer/app/(admin)/ai/rag/components/ChunkBrowserConstants.ts

@@ -0,0 +1,52 @@
+/**
+ * Constants and types for ChunkBrowserQA component.
+ */
+
+export type RegGroupKey =
+  | 'eu_regulation'
+  | 'eu_directive'
+  | 'de_law'
+  | 'at_law'
+  | 'ch_law'
+  | 'national_law'
+  | 'bsi_standard'
+  | 'eu_guideline'
+  | 'international_standard'
+  | 'other'
+
+export const GROUP_LABELS: Record<RegGroupKey, string> = {
+  eu_regulation: 'EU Verordnungen',
+  eu_directive: 'EU Richtlinien',
+  de_law: 'DE Gesetze',
+  at_law: 'AT Gesetze',
+  ch_law: 'CH Gesetze',
+  national_law: 'Nationale Gesetze (EU)',
+  bsi_standard: 'BSI Standards',
+  eu_guideline: 'EDPB / Guidelines',
+  international_standard: 'Internationale Standards',
+  other: 'Sonstige',
+}
+
+export const GROUP_ORDER: RegGroupKey[] = [
+  'eu_regulation', 'eu_directive', 'de_law', 'at_law', 'ch_law',
+  'national_law', 'bsi_standard', 'eu_guideline', 'international_standard', 'other',
+]
+
+export const COLLECTIONS = [
+  'bp_compliance_gesetze',
+  'bp_compliance_ce',
+  'bp_compliance_datenschutz',
+  'bp_dsfa_corpus',
+  'bp_compliance_recht',
+  'bp_legal_templates',
+  'bp_nibis_eh',
+]
+
+export const STRUCTURAL_KEYS = new Set([
+  'article', 'artikel', 'paragraph', 'section_title', 'section', 'chapter',
+  'abschnitt', 'kapitel', 'pages', 'page',
+])
+
+export const HIDDEN_KEYS = new Set([
+  'text', 'content', 'chunk_text', 'id', 'embedding',
+])