feat(email): 使用英文名时间生成默认邮箱前缀

tests/cloudmail-provider.test.js

@@ -1,6 +1,7 @@
 const test = require('node:test');
 const assert = require('node:assert/strict');
 
+require('../background/email-local-part-helpers.js');
 require('../background/cloudmail-provider.js');
 
 function createProviderApi(options = {}) {
@@ -228,3 +229,56 @@ test('fetchCloudMailAddress preserves phone identity through the shared persiste
     },
   ]);
 });
+
+test('fetchCloudMailAddress builds english name, date-time, and suffix local part by default', async () => {
+  const api = globalThis.MultiPageBackgroundCloudMailProvider.createCloudMailProvider({
+    addLog: async () => {},
+    buildCloudMailHeaders: () => ({}),
+    CLOUD_MAIL_DEFAULT_PAGE_SIZE: 20,
+    CLOUD_MAIL_GENERATOR: 'cloudmail',
+    CLOUD_MAIL_PROVIDER: 'cloudmail',
+    fetchImpl: async (url) => {
+      if (String(url).includes('/api/public/addUser')) {
+        return {
+          ok: true,
+          text: async () => JSON.stringify({ code: 200 }),
+        };
+      }
+      return {
+        ok: true,
+        text: async () => JSON.stringify({ code: 200, data: { token: 'token' } }),
+      };
+    },
+    getCloudMailTokenFromResponse: () => 'token',
+    getState: async () => ({}),
+    joinCloudMailUrl: (baseUrl, path) => `${baseUrl}${path}`,
+    normalizeCloudMailAddress: (value) => String(value || '').trim().toLowerCase(),
+    normalizeCloudMailBaseUrl: (value) => String(value || '').trim(),
+    normalizeCloudMailDomain: (value) => String(value || '').trim(),
+    normalizeCloudMailDomains: (values) => values || [],
+    normalizeCloudMailMailApiMessages: () => [],
+    persistRegistrationEmailState: async () => {},
+    pickVerificationMessageWithTimeFallback: () => ({
+      match: null,
+      usedRelaxedFilters: false,
+      usedTimeFallback: false,
+    }),
+    setEmailState: async () => {},
+    setPersistentSettings: async () => {},
+    sleepWithStop: async () => {},
+    throwIfStopped: () => {},
+  });
+
+  const state = {
+    cloudMailBaseUrl: 'https://mail.example.com',
+    cloudMailAdminEmail: 'admin@example.com',
+    cloudMailAdminPassword: 'secret',
+    cloudMailToken: 'token',
+    cloudMailDomain: 'example.com',
+  };
+  const email = await api.fetchCloudMailAddress(state, {
+    date: '2026-05-17T08:09:10.123',
+  });
+
+  assert.match(email, /^[a-z]+20260517080910123[a-z0-9]{4}@example\.com$/);
+});