[split-required] Split final batch of monoliths >1000 LOC

Python (6 files in klausur-service):
- rbac.py (1,132 → 4), admin_api.py (1,012 → 4)
- routes/eh.py (1,111 → 4), ocr_pipeline_geometry.py (1,105 → 5)

Python (2 files in backend-lehrer):
- unit_api.py (1,226 → 6), game_api.py (1,129 → 5)

Website (6 page files):
- 4x klausur-korrektur pages (1,249-1,328 LOC each) → shared components
  in website/components/klausur-korrektur/ (17 shared files)
- companion (1,057 → 10), magic-help (1,017 → 8)

All re-export barrels preserve backward compatibility.
Zero import errors verified.

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

website/components/klausur-korrektur/WorkspaceTopBar.tsx

@@ -0,0 +1,108 @@
+'use client'
+
+/**
+ * Top navigation bar for the Korrektur-Workspace.
+ * Shows back link, student navigation, workflow status, and grade.
+ */
+
+import Link from 'next/link'
+import type { ExaminerWorkflow } from './workspace-types'
+import { WORKFLOW_STATUS_LABELS, ROLE_LABELS, GRADE_LABELS } from './workspace-types'
+
+interface WorkspaceTopBarProps {
+  klausurId: string
+  backPath: string
+  currentIndex: number
+  studentCount: number
+  workflow: ExaminerWorkflow | null
+  saving: boolean
+  totals: { gradePoints: number; weighted: number }
+  onGoToStudent: (direction: 'prev' | 'next') => void
+}
+
+export default function WorkspaceTopBar({
+  klausurId, backPath, currentIndex, studentCount,
+  workflow, saving, totals, onGoToStudent,
+}: WorkspaceTopBarProps) {
+  return (
+    <div className="bg-white border-b border-slate-200 -mx-6 -mt-6 px-6 py-3 mb-4 flex items-center justify-between sticky top-0 z-10">
+      {/* Back link */}
+      <Link
+        href={backPath}
+        className="text-primary-600 hover:text-primary-800 flex items-center gap-1 text-sm"
+      >
+        <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 19l-7-7 7-7" />
+        </svg>
+        Zurueck
+      </Link>
+
+      {/* Student navigation */}
+      <div className="flex items-center gap-4">
+        <button
+          onClick={() => onGoToStudent('prev')}
+          disabled={currentIndex <= 0}
+          className="p-2 rounded-lg hover:bg-slate-100 disabled:opacity-50 disabled:cursor-not-allowed"
+        >
+          <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 19l-7-7 7-7" />
+          </svg>
+        </button>
+        <span className="text-sm font-medium">
+          {currentIndex + 1} / {studentCount}
+        </span>
+        <button
+          onClick={() => onGoToStudent('next')}
+          disabled={currentIndex >= studentCount - 1}
+          className="p-2 rounded-lg hover:bg-slate-100 disabled:opacity-50 disabled:cursor-not-allowed"
+        >
+          <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
+          </svg>
+        </button>
+      </div>
+
+      {/* Workflow status and role */}
+      <div className="flex items-center gap-3">
+        {workflow && (
+          <div className="flex items-center gap-2">
+            <span
+              className={`px-2 py-1 text-xs font-medium rounded-full text-white ${
+                ROLE_LABELS[workflow.user_role]?.color || 'bg-slate-500'
+              }`}
+            >
+              {ROLE_LABELS[workflow.user_role]?.label || workflow.user_role}
+            </span>
+            <span
+              className={`px-2 py-1 text-xs font-medium rounded-full ${
+                WORKFLOW_STATUS_LABELS[workflow.workflow_status]?.color || 'bg-slate-100'
+              }`}
+            >
+              {WORKFLOW_STATUS_LABELS[workflow.workflow_status]?.label || workflow.workflow_status}
+            </span>
+            {workflow.user_role === 'zk' && workflow.visibility_mode !== 'full' && (
+              <span className="px-2 py-1 text-xs bg-purple-100 text-purple-700 rounded-full">
+                {workflow.visibility_mode === 'blind' ? 'Blind-Modus' : 'Semi-Blind'}
+              </span>
+            )}
+          </div>
+        )}
+
+        {saving && (
+          <span className="text-sm text-slate-500 flex items-center gap-1">
+            <div className="animate-spin rounded-full h-3 w-3 border-b-2 border-primary-600"></div>
+            Speichern...
+          </span>
+        )}
+        <div className="text-right">
+          <div className="text-lg font-bold text-slate-800">
+            {totals.gradePoints} Punkte
+          </div>
+          <div className="text-sm text-slate-500">
+            Note: {GRADE_LABELS[totals.gradePoints] || '-'}
+          </div>
+        </div>
+      </div>
+    </div>
+  )
+}