Enforce positive=CREDIT for all BANK account uploads

Instead of relying on per-profile invertAmountSign settings, the upload
route now overrides invertAmountSign: true for any BANK account using
Strategy A. This ensures positive CSV amounts always map to CREDIT
(deposits) regardless of which bank or whether profile was auto-detected.
Credit card logic is unchanged.

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

src/app/api/upload/route.ts

@@ -74,6 +74,12 @@ export async function POST(req: Request) {
     config = result.data
   }
 
+  // For all BANK accounts using a single amount column, positive = deposit (CREDIT),
+  // negative = withdrawal (DEBIT). Override whatever the profile or manual mapping says.
+  if (account.type === 'BANK' && config.strategy === 'A') {
+    config = { ...config, invertAmountSign: true }
+  }
+
   const normalized = normalizeRows(allRows, accountId, config)
 
   // Apply transfer rules first, then budget rules (transfer takes priority)