fix(pitch-deck): close auth gaps, isolate finanzplan scenario access, enforce TS

D1: Remove /api/admin/fp-patch from PUBLIC_PATHS — it was returning live financial
data (fp_liquiditaet rows) to any unauthenticated caller; middleware admin gate now
applies as it does for all /api/admin/* paths.

D2: Add PITCH_ADMIN_SECRET bearer guard to POST /api/financial-model (create scenario)
and PUT /api/financial-model/assumptions (update assumptions) — any authenticated
investor could previously create/modify global financial model data.

D3: Add PITCH_ADMIN_SECRET bearer guard to POST /api/finanzplan/compute — any
investor could trigger a full DB recomputation across all fp_* tables. Also replace
String(error) in error response with a static message.

D4: GET /api/finanzplan/[sheetName] now ignores ?scenarioId= for non-admin callers;
investors always receive the default scenario only. Previously any investor could
enumerate UUIDs and read any scenario's financials including other investors' plans.

D9: Remove `name` from the non-admin /api/finanzplan response — scenario names like
"Wandeldarlehen v2" reveal internal versioning to investors.

D10: Remove hardcoded postgres://breakpilot:breakpilot123@localhost fallback from
lib/db.ts — missing DATABASE_URL now fails loudly instead of silently using stale
credentials that are committed to the repository.

D6: Fix all 4 TypeScript errors that were masked by ignoreBuildErrors:true; bump
tsconfig target to ES2018 (regex s flag in ChatFAB), type lang as 'de'|'en' in
chat route, add 'as string' assertion in adapter.ts. Remove ignoreBuildErrors:true
from next.config.js so future type errors fail the build rather than being silently
shipped.

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

pitch-deck/lib/finanzplan/adapter.ts

@@ -53,8 +53,8 @@ export async function finanzplanToFMResults(pool: Pool, scenarioId?: string): Pr
   const afaRow = betrieb.find((r: any) => r.row_label === 'Abschreibungen')
   const afa = afaRow?.values || emptyMonthly()
 
-  // Liquidität endstand
-  const liqEndRow = liquid.find((r: any) => r.row_label === 'LIQUIDITAET')
+  // Liquidität endstand — match by row_type to handle both 'LIQUIDITÄT' and 'LIQUIDITAET' labels
+  const liqEndRow = liquid.find((r: any) => r.row_type === 'kontostand' && r.row_label?.includes('LIQUIDIT'))
   const cashBalance = liqEndRow?.values || emptyMonthly()
 
   // Headcount
@@ -120,7 +120,7 @@ export async function finanzplanToFMResults(pool: Pool, scenarioId?: string): Pr
   const breakEvenMonth = results.findIndex(r => r.revenue_eur > r.total_costs_eur)
 
   return {
-    scenario_id: sid,
+    scenario_id: sid as string,
     results,
     summary: {
       final_arr: lastMonth?.arr_eur || 0,