fix(ipintelligence): apply configured timeout to MMDB downloads and expose IP intelligence timeout option

test/test.ipintelligence.ts

@@ -99,6 +99,32 @@ tap.test('should use cache when cacheTtl is set', async () => {
   await cached.stop();
 });
 
+tap.test('should apply timeout to IP intelligence MMDB downloads', async () => {
+  const originalFetch = globalThis.fetch;
+  let sawAbort = false;
+  globalThis.fetch = (async (_url: RequestInfo | URL, init?: RequestInit) => {
+    return await new Promise<Response>((_resolve, reject) => {
+      init?.signal?.addEventListener('abort', () => {
+        sawAbort = true;
+        reject(new Error('aborted'));
+      }, { once: true });
+    });
+  }) as typeof fetch;
+
+  const intelligence = new smartnetwork.IpIntelligence({ timeout: 10 });
+  let caught: Error | undefined;
+  try {
+    await (intelligence as any).fetchBuffer('https://example.com/test.mmdb');
+  } catch (error) {
+    caught = error as Error;
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+
+  expect(sawAbort).toEqual(true);
+  expect(caught).toBeTruthy();
+});
+
 tap.test('should stop cleanly (tears down shared smartdns client)', async () => {
   // If the Rust-backed smartdns bridge wasn't destroyed, this test process
   // would hang at exit instead of completing.