KI-AGENT: E-Rechnungen in der Belegvorbereitung verarbeiten

backend/package.json

@@ -9,6 +9,7 @@
     "fill": "ts-node src/webdav/fill-file-sizes.ts",
     "dev:dav": "tsx watch src/webdav/server.ts",
     "build": "tsc",
+    "test:einvoice": "tsx --test tests/einvoice.test.ts",
     "start": "node dist/src/index.js",
     "schema:index": "ts-node scripts/generate-schema-index.ts",
     "bankcodes:update": "tsx scripts/generate-de-bank-codes.ts",
@@ -43,6 +44,7 @@
     "crypto": "^1.0.1",
     "dayjs": "^1.11.18",
     "drizzle-orm": "^0.45.0",
+    "fast-xml-parser": "^5.10.1",
     "fastify": "^5.5.0",
     "fastify-plugin": "^5.0.1",
     "handlebars": "^4.7.8",