[split-required] Split website + studio-v2 monoliths (Phase 3 continued)

Website (14 monoliths split):
- compliance/page.tsx (1,519 → 9), docs/audit (1,262 → 20)
- quality (1,231 → 16), alerts (1,203 → 10), docs (1,202 → 11)
- i18n.ts (1,173 → 8 language files)
- unity-bridge (1,094 → 12), backlog (1,087 → 6)
- training (1,066 → 8), rag (1,063 → 8)
- Deleted index_original.ts (4,899 LOC dead backup)

Studio-v2 (5 monoliths split):
- meet/page.tsx (1,481 → 9), messages (1,166 → 9)
- AlertsB2BContext.tsx (1,165 → 5 modules)
- alerts-b2b/page.tsx (1,019 → 6), korrektur/archiv (1,001 → 6)

All existing imports preserved. Zero new TypeScript errors.

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

website/app/admin/docs/_components/TabNavigation.tsx

@@ -0,0 +1,31 @@
+'use client'
+
+import type { TabType } from '../types'
+import { TAB_DEFINITIONS } from '../data'
+
+interface TabNavigationProps {
+  activeTab: TabType
+  onTabChange: (tab: TabType) => void
+}
+
+export default function TabNavigation({ activeTab, onTabChange }: TabNavigationProps) {
+  return (
+    <div className="border-b border-slate-200 mb-6">
+      <nav className="flex gap-6">
+        {TAB_DEFINITIONS.map((tab) => (
+          <button
+            key={tab.id}
+            onClick={() => onTabChange(tab.id as TabType)}
+            className={`pb-3 px-1 text-sm font-medium border-b-2 transition-colors ${
+              activeTab === tab.id
+                ? 'border-primary-600 text-primary-600'
+                : 'border-transparent text-slate-500 hover:text-slate-700'
+            }`}
+          >
+            {tab.label}
+          </button>
+        ))}
+      </nav>
+    </div>
+  )
+}