fix(mobile): abort uni.request when the platform timeout does not fire

Some uni-app platforms ignore the `timeout` option, leaving the returned
promise pending forever and hanging the calling page with no error path.

Drive the deadline locally: keep a single-shot `finish` guard so success,
failure and timeout can only settle once, and on timeout call `task.abort()`
before rejecting so the in-flight request is released instead of leaking.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

mobile-uni/tests/api-timeout.test.mjs

@@ -0,0 +1,40 @@
+import assert from 'node:assert/strict';
+import { after, test } from 'node:test';
+import { fileURLToPath } from 'node:url';
+import { createServer } from 'vite';
+
+let abortCount = 0;
+globalThis.plus = {};
+globalThis.uni = {
+  getStorageSync: () => '',
+  removeStorageSync: () => {},
+  request: () => ({
+    abort: () => {
+      abortCount += 1;
+    }
+  })
+};
+
+const vite = await createServer({
+  root: fileURLToPath(new URL('..', import.meta.url)),
+  configFile: false,
+  optimizeDeps: { noDiscovery: true },
+  server: { middlewareMode: true, hmr: false },
+  appType: 'custom'
+});
+
+after(async () => {
+  await vite.close();
+  delete globalThis.plus;
+  delete globalThis.uni;
+});
+
+const { apiRequest } = await vite.ssrLoadModule('/src/services/api.ts');
+
+test('App 原生请求遗漏回调时主动超时并中止任务', async () => {
+  await assert.rejects(
+    apiRequest({ url: '/api/test', timeout: 10 }),
+    /网络请求超时/
+  );
+  assert.equal(abortCount, 1);
+});