refactor: 移除未使用的函数和变量，简化 Plus Checkout 创建逻辑

background/steps/create-plus-checkout.js

@@ -2,21 +2,8 @@
   root.MultiPageBackgroundPlusCheckoutCreate = factory();
 })(typeof self !== 'undefined' ? self : globalThis, function createBackgroundPlusCheckoutCreateModule() {
   const PLUS_CHECKOUT_SOURCE = 'plus-checkout';
-  const SIGNUP_PAGE_SOURCE = 'signup-page';
   const PLUS_CHECKOUT_ENTRY_URL = 'https://chatgpt.com/';
   const PLUS_CHECKOUT_INJECT_FILES = ['content/utils.js', 'content/plus-checkout.js'];
-  const PLUS_CHECKOUT_ONLY_INJECT_FILES = ['content/plus-checkout.js'];
-
-  function isReusableChatGptTabUrl(url = '') {
-    try {
-      const parsed = new URL(String(url || ''));
-      const hostname = parsed.hostname.toLowerCase();
-      return ['chatgpt.com', 'www.chatgpt.com', 'chat.openai.com'].includes(hostname)
-        && !/^\/checkout(?:\/|$)/i.test(parsed.pathname || '');
-    } catch {
-      return false;
-    }
-  }
 
   function createPlusCheckoutCreateExecutor(deps = {}) {
     const {
@@ -24,59 +11,33 @@
       chrome,
       completeStepFromBackground,
       ensureContentScriptReadyOnTabUntilStopped,
-      getTabId,
-      isTabAlive,
       registerTab,
-      reuseOrCreateTab,
       sendTabMessageUntilStopped,
       setState,
       sleepWithStop,
       waitForTabCompleteUntilStopped,
     } = deps;
 
-    async function getReusableSignupChatGptTabId() {
-      if (typeof getTabId !== 'function' || typeof isTabAlive !== 'function') {
-        return null;
+    async function openFreshChatGptTabForCheckoutCreate() {
+      const tab = await chrome.tabs.create({ url: PLUS_CHECKOUT_ENTRY_URL, active: true });
+      const tabId = Number(tab?.id);
+      if (!Number.isInteger(tabId)) {
+        throw new Error('步骤 6：打开 ChatGPT 页面失败，未获取到有效标签页 ID。');
       }
-      const tabId = await getTabId(SIGNUP_PAGE_SOURCE);
-      if (!tabId || !(await isTabAlive(SIGNUP_PAGE_SOURCE))) {
-        return null;
+      if (typeof registerTab === 'function') {
+        await registerTab(PLUS_CHECKOUT_SOURCE, tabId);
       }
-      const tab = await chrome.tabs.get(tabId).catch(() => null);
-      return tab && isReusableChatGptTabUrl(tab.url) ? tabId : null;
-    }
-
-    async function resolveChatGptTabForCheckoutCreate() {
-      const existingSignupTabId = await getReusableSignupChatGptTabId();
-      if (existingSignupTabId) {
-        await chrome.tabs.update(existingSignupTabId, { active: true });
-        if (typeof registerTab === 'function') {
-          await registerTab(PLUS_CHECKOUT_SOURCE, existingSignupTabId);
-        }
-        await addLog('步骤 6：检测到第 5 步已打开 ChatGPT 页面，直接接管当前标签页创建 Plus Checkout。', 'info');
-        return {
-          tabId: existingSignupTabId,
-          injectFiles: PLUS_CHECKOUT_ONLY_INJECT_FILES,
-        };
-      }
-
-      const tabId = await reuseOrCreateTab(PLUS_CHECKOUT_SOURCE, PLUS_CHECKOUT_ENTRY_URL, {
-        reloadIfSameUrl: false,
-      });
-      return {
-        tabId,
-        injectFiles: PLUS_CHECKOUT_INJECT_FILES,
-      };
+      return tabId;
     }
 
     async function executePlusCheckoutCreate() {
-      await addLog('步骤 6：正在打开 ChatGPT 会话页，准备创建 Plus Checkout...', 'info');
-      const { tabId, injectFiles } = await resolveChatGptTabForCheckoutCreate();
+      await addLog('步骤 6：正在新打开 ChatGPT 会话页，准备创建 Plus Checkout...', 'info');
+      const tabId = await openFreshChatGptTabForCheckoutCreate();
 
       await waitForTabCompleteUntilStopped(tabId);
       await sleepWithStop(1000);
       await ensureContentScriptReadyOnTabUntilStopped(PLUS_CHECKOUT_SOURCE, tabId, {
-        inject: injectFiles,
+        inject: PLUS_CHECKOUT_INJECT_FILES,
         injectSource: PLUS_CHECKOUT_SOURCE,
         logMessage: '步骤 6：ChatGPT 页面仍在加载，等待 Plus Checkout 脚本就绪...',
       });