Fix #44 with Handlebars Templates

backend/src/modules/serialexecution.service.ts

@@ -1,6 +1,5 @@
 import dayjs from "dayjs";
 import quarterOfYear from "dayjs/plugin/quarterOfYear";
-import Handlebars from "handlebars";
 import axios from "axios";
 import { eq, inArray, and } from "drizzle-orm"; // Drizzle Operatoren
 
@@ -10,6 +9,7 @@ import { saveFile } from "../utils/files";
 import {FastifyInstance} from "fastify";
 import {useNextNumberRangeNumber} from "../utils/functions";
 import {createInvoicePDF} from "../utils/pdf"; // Achtung: Muss Node.js Buffer unterstützen!
+import { documentTemplateHandlebars } from "../utils/handlebars";
 
 dayjs.extend(quarterOfYear);
 
@@ -609,8 +609,8 @@ export function getDocumentDataBackend(
         };
     };
 
-    const templateStartText = Handlebars.compile(itemInfo.startText || "");
-    const templateEndText = Handlebars.compile(itemInfo.endText || "");
+    const templateStartText = documentTemplateHandlebars.compile(itemInfo.startText || "");
+    const templateEndText = documentTemplateHandlebars.compile(itemInfo.endText || "");
 
     // --- 6. Title Sums Formatting ---
     let returnTitleSums: Record<string, string> = {};