feat: add pitch-deck service to core infrastructure

Migrated pitch-deck from breakpilot-pwa to breakpilot-core.
Container: bp-core-pitch-deck on port 3012.

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

pitch-deck/app/page.tsx

@@ -0,0 +1,15 @@
+'use client'
+
+import { useState, useCallback } from 'react'
+import { Language } from '@/lib/types'
+import PitchDeck from '@/components/PitchDeck'
+
+export default function Home() {
+  const [lang, setLang] = useState<Language>('de')
+
+  const toggleLanguage = useCallback(() => {
+    setLang(prev => prev === 'de' ? 'en' : 'de')
+  }, [])
+
+  return <PitchDeck lang={lang} onToggleLanguage={toggleLanguage} />
+}