fix: remove hardcoded API key from integration tests

Require SGAI_API_KEY env var instead of fallback

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: FrancescoSaverioZuppichini

tests/integration.spec.ts

@@ -1,7 +1,8 @@
 import { describe, expect, test } from "bun:test";
 import { crawl, extract, getCredits, history, scrape, search } from "../src/index.js";
 
-const API_KEY = process.env.SGAI_API_KEY || "sgai-669918e5-55be-4752-a684-f6da788d1384";
+const API_KEY = process.env.SGAI_API_KEY;
+if (!API_KEY) throw new Error("SGAI_API_KEY env var required for integration tests");
 
 describe("integration", () => {
 	test("getCredits", async () => {