fix: harden portfolio import

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@family-budget/backend",
-  "version": "0.8.0",
+  "version": "0.8.1",
   "private": true,
   "scripts": {
     "dev": "tsx watch src/app.ts",
@@ -9,6 +9,7 @@
     "migrate": "tsx src/db/migrate.ts",
     "migrate:prod": "node dist/db/migrate.js",
     "test:analytics": "tsx src/services/analyticsSemantics.test.ts",
+    "test:portfolio": "tsx src/services/portfolio.test.ts",
     "test:analytics:db": "NODE_ENV=test tsx src/services/analytics.integration.test.ts",
     "test:import:db": "NODE_ENV=test tsx src/services/import.integration.test.ts",
     "test:llm": "tsx src/scripts/testLlm.ts"