merge: 合并最新 dev 分支（cloudflare-temp-email + iCloud）

- 解决 background.js / sidepanel.html / sidepanel.js / 测试文件共 24 处冲突
- LuckMail、Cloudflare Temp Email、iCloud 三种邮箱提供商正确共存
- step9 清理范围测试对齐 dev 分支行为（closeTabsByUrlPrefix 排除 OAuth callback URL）
- LuckMail 测试补充 dev 分支新增依赖的 mock
- 全部 76 个测试通过

tests/step9-localhost-cleanup-scope.test.js

@@ -52,7 +52,12 @@ function extractFunction(name) {
 
 const bundle = [
   extractFunction('getTabRegistry'),
+  extractFunction('normalizeEmailGenerator'),
   extractFunction('parseUrlSafely'),
+  extractFunction('isHotmailProvider'),
+  extractFunction('isCustomMailProvider'),
+  extractFunction('isGeneratedAliasProvider'),
+  extractFunction('shouldUseCustomRegistrationEmail'),
   extractFunction('isLocalhostOAuthCallbackUrl'),
   extractFunction('isLocalhostOAuthCallbackTabMatch'),
   extractFunction('closeLocalhostCallbackTabs'),
@@ -62,6 +67,9 @@ const bundle = [
 ].join('\n');
 
 const api = new Function(`
+const HOTMAIL_PROVIDER = 'hotmail-api';
+const CLOUDFLARE_TEMP_EMAIL_PROVIDER = 'cloudflare-temp-email';
+const CLOUDFLARE_TEMP_EMAIL_GENERATOR = 'cloudflare-temp-email';
 let currentState = {
   tabRegistry: {
     'signup-page': { tabId: 1, ready: true },
@@ -122,6 +130,11 @@ async function addLog(message) {
   logMessages.push(message);
 }
 
+async function finalizeIcloudAliasAfterSuccessfulFlow() {}
+function shouldUseCustomRegistrationEmail() {
+  return false;
+}
+
 ${bundle}
 
 return {
@@ -183,8 +196,8 @@ return {
   let snapshot = api.snapshot();
   assert.deepStrictEqual(
     snapshot.removedBatches,
-    [[1], [2, 3]],
-    'handleStepData(9) 应先关闭当前 callback 页，再按同前缀路径清理残留页'
+    [[1], [2]],
+    'handleStepData(9) 应先关闭当前 callback 页，再按同源首段路径清理残留页'
   );
   assert.strictEqual(
     snapshot.currentState.tabRegistry['signup-page'],