feat(banking): add cost centres and VAT to account allocations

backend/db/schema/statementallocations.ts

@@ -18,6 +18,7 @@ import { incominginvoices } from "./incominginvoices"
 import { createddocuments } from "./createddocuments"
 import { bankstatements } from "./bankstatements"
 import { accounts } from "./accounts" // Falls noch nicht erstellt → bitte melden!
+import { costcentres } from "./costcentres"
 
 export const statementallocations = pgTable("statementallocations", {
     id: uuid("id").primaryKey().defaultRandom(),
@@ -58,6 +59,7 @@ export const statementallocations = pgTable("statementallocations", {
 
     manualBookingDate: text("manual_booking_date"),
     datevTaxKey: text("datev_tax_key"),
+    costcentre: uuid("costcentre").references(() => costcentres.id),
 
     bookingMode: text("booking_mode").notNull().default("expense"),
     depreciationMonths: integer("depreciation_months"),