fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

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

website/components/compliance/LanguageSwitch.tsx

@@ -0,0 +1,109 @@
+'use client'
+
+/**
+ * LanguageSwitch Component
+ *
+ * Toggle button for switching between German and English terminology.
+ * Stores preference in localStorage.
+ */
+
+import { useState, useEffect } from 'react'
+import { Language, DEFAULT_LANGUAGE } from '@/lib/compliance-i18n'
+
+interface LanguageSwitchProps {
+  onChange?: (lang: Language) => void
+  className?: string
+}
+
+const STORAGE_KEY = 'breakpilot-compliance-lang'
+
+export default function LanguageSwitch({ onChange, className = '' }: LanguageSwitchProps) {
+  const [language, setLanguage] = useState<Language>(DEFAULT_LANGUAGE)
+  const [mounted, setMounted] = useState(false)
+
+  // Load language from localStorage on mount
+  useEffect(() => {
+    setMounted(true)
+    const stored = localStorage.getItem(STORAGE_KEY) as Language | null
+    if (stored && (stored === 'de' || stored === 'en')) {
+      setLanguage(stored)
+      onChange?.(stored)
+    }
+  }, [onChange])
+
+  const toggleLanguage = () => {
+    const newLang: Language = language === 'de' ? 'en' : 'de'
+    setLanguage(newLang)
+    localStorage.setItem(STORAGE_KEY, newLang)
+    onChange?.(newLang)
+  }
+
+  // Avoid hydration mismatch
+  if (!mounted) {
+    return (
+      <div className={`h-8 w-16 bg-slate-100 rounded-full animate-pulse ${className}`} />
+    )
+  }
+
+  return (
+    <button
+      onClick={toggleLanguage}
+      className={`
+        relative inline-flex items-center h-8 px-1
+        bg-slate-100 hover:bg-slate-200
+        rounded-full transition-colors
+        focus:outline-none focus:ring-2 focus:ring-primary-500 focus:ring-offset-2
+        ${className}
+      `}
+      title={language === 'de' ? 'Switch to English' : 'Zu Deutsch wechseln'}
+      aria-label={language === 'de' ? 'Switch to English' : 'Zu Deutsch wechseln'}
+    >
+      {/* DE Button */}
+      <span
+        className={`
+          px-2 py-1 text-xs font-semibold rounded-full transition-all
+          ${language === 'de'
+            ? 'bg-white text-slate-900 shadow-sm'
+            : 'text-slate-500 hover:text-slate-700'
+          }
+        `}
+      >
+        DE
+      </span>
+
+      {/* EN Button */}
+      <span
+        className={`
+          px-2 py-1 text-xs font-semibold rounded-full transition-all
+          ${language === 'en'
+            ? 'bg-white text-slate-900 shadow-sm'
+            : 'text-slate-500 hover:text-slate-700'
+          }
+        `}
+      >
+        EN
+      </span>
+    </button>
+  )
+}
+
+/**
+ * Hook to get and set compliance language
+ */
+export function useComplianceLanguage(): [Language, (lang: Language) => void] {
+  const [language, setLanguage] = useState<Language>(DEFAULT_LANGUAGE)
+
+  useEffect(() => {
+    const stored = localStorage.getItem(STORAGE_KEY) as Language | null
+    if (stored && (stored === 'de' || stored === 'en')) {
+      setLanguage(stored)
+    }
+  }, [])
+
+  const setAndStore = (lang: Language) => {
+    setLanguage(lang)
+    localStorage.setItem(STORAGE_KEY, lang)
+  }
+
+  return [language, setAndStore]
+}