fix(pitch-deck): TTS language detection, technical FAQ, proper German umlauts + abbreviations

TTS Language Bug:
- ChatFAB: detect response language from text content instead of UI language
- German text with umlauts/ß triggers German TTS even when UI is in English

Presenter Script (German TTS pronunciation):
- Add proper umlauts (ä/ö/ü) throughout German text
- Expand abbreviations for clear pronunciation:
  DSGVO → Datenschutz-Grundverordnung
  SAST → Static Application Security Testing
  DAST → Dynamic Application Security Testing
  SBOM → Software Bill of Materials
  VVT → Verarbeitungsverzeichnis
  TOMs → technisch-organisatorische Maßnahmen
  BSI → Bundesamt für Sicherheit in der Informationstechnik
  KMU → kleine und mittlere Unternehmen, etc.

Technical FAQ (12 new entries):
- BGE-M3, RAG, Qdrant, Cross-Encoder, Hybrid Search
- SAST/DAST, SBOM, BSI, Cloud Providers (SysEleven/Hetzner)
- Controls/Prüfaspekte, Policy Engine, VVT/TOMs/DSFA

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

pitch-deck/components/ChatFAB.tsx

@@ -157,7 +157,10 @@ export default function ChatFAB({
       const res = await fetch('/api/presenter/tts', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ text: cleanText, language: lang }),
+        // Detect response language from text content (not UI language)
+        // German text typically contains umlauts, ß, or common German words
+        const textLang = /[äöüÄÖÜß]|(?:^|\s)(?:das|die|der|und|ist|wir|ein|für|mit|auf|von|den|des)\s/i.test(cleanText) ? 'de' : lang
+        body: JSON.stringify({ text: cleanText, language: textLang }),
         signal: controller.signal,
       })
       if (!res.ok || controller.signal.aborted) return