refactor(admin): split academy/[id], iace/hazards, ai-act pages

Extracted components and constants into _components/ subdirectories
to bring all three pages under the 300 LOC soft target (was 651/628/612,
now 255/232/278 LOC respectively). Zero behavior changes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

admin-compliance/app/sdk/academy/[id]/_components/CourseTabs.tsx

@@ -0,0 +1,37 @@
+'use client'
+
+type TabId = 'overview' | 'lessons' | 'enrollments' | 'videos'
+
+interface CourseTabsProps {
+  activeTab: TabId
+  onTabChange: (tab: TabId) => void
+}
+
+const TAB_LABELS: Record<TabId, string> = {
+  overview: 'Uebersicht',
+  lessons: 'Lektionen',
+  enrollments: 'Einschreibungen',
+  videos: 'Videos',
+}
+
+export function CourseTabs({ activeTab, onTabChange }: CourseTabsProps) {
+  return (
+    <div className="border-b border-gray-200">
+      <nav className="flex gap-1 -mb-px">
+        {(['overview', 'lessons', 'enrollments', 'videos'] as TabId[]).map(tab => (
+          <button
+            key={tab}
+            onClick={() => onTabChange(tab)}
+            className={`px-4 py-3 text-sm font-medium border-b-2 transition-colors ${
+              activeTab === tab
+                ? 'border-purple-600 text-purple-600'
+                : 'border-transparent text-gray-500 hover:text-gray-700'
+            }`}
+          >
+            {TAB_LABELS[tab]}
+          </button>
+        ))}
+      </nav>
+    </div>
+  )
+}