test: add LLM service tests

Made-with: Cursor

tests/setup.ts

@@ -2,4 +2,10 @@ import { beforeAll, vi } from 'vitest';
 
 beforeAll(() => {
   vi.stubEnv('NODE_ENV', 'test');
+  if (!process.env.DATABASE_URL) {
+    process.env.DATABASE_URL = 'postgresql://test:test@localhost:5432/test';
+  }
+  if (!process.env.JWT_SECRET) {
+    process.env.JWT_SECRET = 'test-secret-min-32-chars-long-for-validation';
+  }
 });