[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/GridTableColumnHeader.tsx

@@ -0,0 +1,84 @@
+'use client'
+
+import type { GridColumn } from './types'
+
+interface GridTableColumnHeaderProps {
+  col: GridColumn
+  colIndex: number
+  numCols: number
+  zoneIndex: number
+  onToggleColumnBold: (zoneIndex: number, colIndex: number) => void
+  onDeleteColumn?: (zoneIndex: number, colIndex: number) => void
+  onAddColumn?: (zoneIndex: number, afterColIndex: number) => void
+  onColResizeStart: (colIndex: number, startX: number) => void
+}
+
+export function GridTableColumnHeader({
+  col,
+  colIndex,
+  numCols,
+  zoneIndex,
+  onToggleColumnBold,
+  onDeleteColumn,
+  onAddColumn,
+  onColResizeStart,
+}: GridTableColumnHeaderProps) {
+  return (
+    <div
+      className={`group/colhdr relative px-2 py-1.5 text-xs font-medium border-b border-r border-gray-200 dark:border-gray-700 bg-gray-50 dark:bg-gray-800/50 cursor-pointer select-none transition-colors hover:bg-gray-100 dark:hover:bg-gray-700 ${
+        col.bold ? 'text-teal-700 dark:text-teal-300' : 'text-gray-600 dark:text-gray-400'
+      }`}
+      onClick={() => onToggleColumnBold(zoneIndex, col.index)}
+      title={`Spalte ${col.index + 1} — Klick fuer Fett-Toggle`}
+    >
+      <div className="flex items-center gap-1 justify-center truncate">
+        <span>{col.label}</span>
+        {col.bold && (
+          <span className="text-[9px] px-1 py-0 rounded bg-teal-100 dark:bg-teal-900/40 text-teal-600 dark:text-teal-400">
+            B
+          </span>
+        )}
+      </div>
+      {/* Delete column button (visible on hover) */}
+      {onDeleteColumn && numCols > 1 && (
+        <button
+          className="absolute top-0 left-0 w-4 h-4 flex items-center justify-center bg-red-500 text-white rounded-br text-[9px] leading-none opacity-0 group-hover/colhdr:opacity-100 transition-opacity z-30"
+          onClick={(e) => {
+            e.stopPropagation()
+            if (confirm(`Spalte "${col.label}" loeschen?`)) {
+              onDeleteColumn(zoneIndex, col.index)
+            }
+          }}
+          title={`Spalte "${col.label}" loeschen`}
+        >
+          x
+        </button>
+      )}
+      {/* Add column button — small icon at bottom-right, below resize handle */}
+      {onAddColumn && (
+        <button
+          className="absolute -right-[7px] -bottom-[7px] w-[14px] h-[14px] flex items-center justify-center text-teal-500 opacity-0 group-hover/colhdr:opacity-100 transition-opacity z-30 hover:bg-teal-100 dark:hover:bg-teal-900/40 rounded-full bg-white dark:bg-gray-800 border border-gray-200 dark:border-gray-700"
+          onClick={(e) => {
+            e.stopPropagation()
+            onAddColumn(zoneIndex, col.index)
+          }}
+          title={`Spalte nach "${col.label}" einfuegen`}
+        >
+          <svg className="w-2.5 h-2.5" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={3}>
+            <path strokeLinecap="round" strokeLinejoin="round" d="M12 4v16m8-8H4" />
+          </svg>
+        </button>
+      )}
+      {/* Right-edge resize handle — wide grab area, highest z-index */}
+      {colIndex < numCols - 1 && (
+        <div
+          className="absolute top-0 -right-[4px] w-[9px] h-full cursor-col-resize hover:bg-teal-400/40 z-40"
+          onMouseDown={(e) => {
+            e.stopPropagation()
+            onColResizeStart(colIndex, e.clientX)
+          }}
+        />
+      )}
+    </div>
+  )
+}