feat(pitch-deck): Unit Economics chart in Finanzplan + larger sub-text + remove Container metric

Finanzplan Charts tab: new Unit Economics chart showing ACV, Gross Margin,
NRR, EBIT Margin as mini bar charts per year (2026-2030).

BusinessModelSlide: sub-text under Unit Economics increased from 10px → xs (12px).

DB: Removed "Container in Produktion" metric from pitch_metrics + all versions.

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

pitch-deck/components/slides/BusinessModelSlide.tsx

@@ -144,7 +144,7 @@ export default function BusinessModelSlide({ lang, isWandeldarlehen }: BusinessM
                           <span className="text-xs text-white/40 uppercase tracking-wider">{m.label}</span>
                           <span className={`text-lg font-black ${m.color}`}>{m.value}</span>
                         </div>
-                        <p className="text-[10px] text-white/30">{m.sub}</p>
+                        <p className="text-xs text-white/50">{m.sub}</p>
                       </div>
                     </div>
                   )