[split-required] Split 58 monoliths across Python, Go, TypeScript (Phases 1-3)

Phase 1 — Python (klausur-service): 5 monoliths → 36 files
- dsfa_corpus_ingestion.py (1,828 LOC → 5 files)
- cv_ocr_engines.py (2,102 LOC → 7 files)
- cv_layout.py (3,653 LOC → 10 files)
- vocab_worksheet_api.py (2,783 LOC → 8 files)
- grid_build_core.py (1,958 LOC → 6 files)

Phase 2 — Go (edu-search-service, school-service): 8 monoliths → 19 files
- staff_crawler.go (1,402 → 4), policy/store.go (1,168 → 3)
- policy_handlers.go (700 → 2), repository.go (684 → 2)
- search.go (592 → 2), ai_extraction_handlers.go (554 → 2)
- seed_data.go (591 → 2), grade_service.go (646 → 2)

Phase 3 — TypeScript (admin-lehrer): 45 monoliths → 220+ files
- sdk/types.ts (2,108 → 16 domain files)
- ai/rag/page.tsx (2,686 → 14 files)
- 22 page.tsx files split into _components/ + _hooks/
- 11 component files split into sub-components
- 10 SDK data catalogs added to loc-exceptions
- Deleted dead backup index_original.ts (4,899 LOC)

All original public APIs preserved via re-export facades.
Zero new errors: Python imports verified, Go builds clean,
TypeScript tsc --noEmit shows only pre-existing errors.

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

admin-lehrer/components/grid-editor/GridTableRowHeader.tsx

@@ -0,0 +1,82 @@
+'use client'
+
+import type { GridRow } from './types'
+
+interface GridTableRowHeaderProps {
+  row: GridRow
+  zoneIndex: number
+  rowCount: number
+  rowH: number
+  onToggleRowHeader: (zoneIndex: number, rowIndex: number) => void
+  onDeleteRow?: (zoneIndex: number, rowIndex: number) => void
+  onAddRow?: (zoneIndex: number, afterRowIndex: number) => void
+  onRowResizeStart: (rowIndex: number, startY: number, currentHeight: number) => void
+}
+
+export function GridTableRowHeader({
+  row,
+  zoneIndex,
+  rowCount,
+  rowH,
+  onToggleRowHeader,
+  onDeleteRow,
+  onAddRow,
+  onRowResizeStart,
+}: GridTableRowHeaderProps) {
+  return (
+    <div
+      className={`group/rowhdr relative sticky left-0 z-10 flex items-center justify-center text-[10px] border-b border-r border-gray-200 dark:border-gray-700 cursor-pointer select-none transition-colors hover:bg-gray-100 dark:hover:bg-gray-700 ${
+        row.is_header
+          ? 'bg-blue-50 dark:bg-blue-900/20 text-blue-600 dark:text-blue-400 font-medium'
+          : row.is_footer
+          ? 'bg-amber-50 dark:bg-amber-900/20 text-amber-600 dark:text-amber-400 font-medium'
+          : 'bg-gray-50 dark:bg-gray-800/50 text-gray-400 dark:text-gray-500'
+      }`}
+      style={{ height: `${rowH}px` }}
+      onClick={() => onToggleRowHeader(zoneIndex, row.index)}
+      title={`Zeile ${row.index + 1} — Klick: ${row.is_header ? 'Footer' : row.is_footer ? 'Normal' : 'Header'}`}
+    >
+      {row.index + 1}
+      {row.is_header && <span className="block text-[8px]">H</span>}
+      {row.is_footer && <span className="block text-[8px]">F</span>}
+      {/* Delete row button (visible on hover) */}
+      {onDeleteRow && rowCount > 1 && (
+        <button
+          className="absolute top-0 left-0 w-4 h-4 flex items-center justify-center bg-red-500 text-white rounded-br text-[9px] leading-none opacity-0 group-hover/rowhdr:opacity-100 transition-opacity z-30"
+          onClick={(e) => {
+            e.stopPropagation()
+            if (confirm(`Zeile ${row.index + 1} loeschen?`)) {
+              onDeleteRow(zoneIndex, row.index)
+            }
+          }}
+          title={`Zeile ${row.index + 1} loeschen`}
+        >
+          x
+        </button>
+      )}
+      {/* Add row button (visible on hover, below this row) */}
+      {onAddRow && (
+        <button
+          className="absolute -bottom-[7px] left-0 w-full h-[14px] flex items-center justify-center text-teal-500 opacity-0 group-hover/rowhdr:opacity-100 transition-opacity z-30 hover:bg-teal-100 dark:hover:bg-teal-900/40 rounded"
+          onClick={(e) => {
+            e.stopPropagation()
+            onAddRow(zoneIndex, row.index)
+          }}
+          title={`Zeile nach ${row.index + 1} einfuegen`}
+        >
+          <svg className="w-3 h-3" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2.5}>
+            <path strokeLinecap="round" strokeLinejoin="round" d="M12 4v16m8-8H4" />
+          </svg>
+        </button>
+      )}
+      {/* Bottom-edge resize handle */}
+      <div
+        className="absolute bottom-0 left-0 w-full h-[4px] cursor-row-resize hover:bg-teal-400/40 z-20"
+        onMouseDown={(e) => {
+          e.stopPropagation()
+          onRowResizeStart(row.index, e.clientY, rowH)
+        }}
+      />
+    </div>
+  )
+}