feat: implement multi-step background process for user registration

- Add step 1: Open ChatGPT homepage and prepare for signup.
- Add step 2: Handle email submission and ensure the signup entry page is ready.
- Add step 3: Fill in the password using either a custom or generated password.
- Add step 4: Confirm the registration verification page and handle email verification.
- Add step 5: Generate random user details and handle onboarding redirection.
- Add step 6: Manage OAuth login process and handle login verification.
- Add step 7: Retrieve verification code from email and manage retries.
- Add step 8: Handle consent page interactions and manage callback URLs.
- Add step 9: Submit callback information to CPA or SUB2API based on user settings.
- Implement tests to ensure all steps are correctly imported and functional.

background/steps/step7.js

@@ -0,0 +1,146 @@
+(function attachBackgroundStep7(root, factory) {
+  root.MultiPageBackgroundStep7 = factory();
+})(typeof self !== 'undefined' ? self : globalThis, function createBackgroundStep7Module() {
+  function createStep7Executor(deps = {}) {
+    const {
+      addLog,
+      chrome,
+      CLOUDFLARE_TEMP_EMAIL_PROVIDER,
+      confirmCustomVerificationStepBypass,
+      ensureStep7VerificationPageReady,
+      executeStep6,
+      getMailConfig,
+      getState,
+      getTabId,
+      HOTMAIL_PROVIDER,
+      isTabAlive,
+      isVerificationMailPollingError,
+      LUCKMAIL_PROVIDER,
+      resolveVerificationStep,
+      reuseOrCreateTab,
+      setState,
+      setStepStatus,
+      shouldSkipLoginVerificationForCpaCallback,
+      shouldUseCustomRegistrationEmail,
+      sleepWithStop,
+      STANDARD_MAIL_VERIFICATION_RESEND_INTERVAL_MS,
+      STEP7_MAIL_POLLING_RECOVERY_MAX_ATTEMPTS,
+      throwIfStopped,
+    } = deps;
+
+    async function runStep7Attempt(state) {
+      const mail = getMailConfig(state);
+      if (mail.error) throw new Error(mail.error);
+      const stepStartedAt = Date.now();
+      const authTabId = await getTabId('signup-page');
+
+      if (authTabId) {
+        await chrome.tabs.update(authTabId, { active: true });
+      } else {
+        if (!state.oauthUrl) {
+          throw new Error('缺少登录用 OAuth 链接，请先完成步骤 6。');
+        }
+        await reuseOrCreateTab('signup-page', state.oauthUrl);
+      }
+
+      throwIfStopped();
+      await ensureStep7VerificationPageReady();
+      await addLog('步骤 7：登录验证码页面已就绪，开始获取验证码。', 'info');
+
+      if (shouldUseCustomRegistrationEmail(state)) {
+        await confirmCustomVerificationStepBypass(7);
+        return;
+      }
+
+      throwIfStopped();
+      if (mail.provider === HOTMAIL_PROVIDER || mail.provider === LUCKMAIL_PROVIDER || mail.provider === CLOUDFLARE_TEMP_EMAIL_PROVIDER) {
+        await addLog(`步骤 7：正在通过 ${mail.label} 轮询验证码...`);
+      } else {
+        await addLog(`步骤 7：正在打开${mail.label}...`);
+
+        const alive = await isTabAlive(mail.source);
+        if (alive) {
+          if (mail.navigateOnReuse) {
+            await reuseOrCreateTab(mail.source, mail.url, {
+              inject: mail.inject,
+              injectSource: mail.injectSource,
+            });
+          } else {
+            const tabId = await getTabId(mail.source);
+            await chrome.tabs.update(tabId, { active: true });
+          }
+        } else {
+          await reuseOrCreateTab(mail.source, mail.url, {
+            inject: mail.inject,
+            injectSource: mail.injectSource,
+          });
+        }
+      }
+
+      await resolveVerificationStep(7, state, mail, {
+        filterAfterTimestamp: mail.provider === HOTMAIL_PROVIDER ? undefined : Math.max(0, stepStartedAt - 60000),
+        requestFreshCodeFirst: false,
+        resendIntervalMs: mail.provider === HOTMAIL_PROVIDER ? 0 : STANDARD_MAIL_VERIFICATION_RESEND_INTERVAL_MS,
+      });
+    }
+
+    async function rerunStep6ForStep7Recovery() {
+      const currentState = await getState();
+      await addLog('步骤 7：正在回到步骤 6，重新发起登录验证码流程...', 'warn');
+      await executeStep6(currentState);
+      await sleepWithStop(3000);
+    }
+
+    async function executeStep7(state) {
+      if (shouldSkipLoginVerificationForCpaCallback(state)) {
+        await setState({
+          lastLoginCode: null,
+          loginVerificationRequestedAt: null,
+        });
+        await setStepStatus(7, 'skipped');
+        await addLog('步骤 7：当前已选择“第六步回调”，本轮无需获取登录验证码。', 'warn');
+        return;
+      }
+
+      let currentState = state;
+      let mailPollingAttempt = 1;
+      let lastMailPollingError = null;
+
+      while (true) {
+        try {
+          await runStep7Attempt(currentState);
+          return;
+        } catch (err) {
+          if (!isVerificationMailPollingError(err)) {
+            throw err;
+          }
+
+          lastMailPollingError = err;
+          if (mailPollingAttempt >= STEP7_MAIL_POLLING_RECOVERY_MAX_ATTEMPTS) {
+            break;
+          }
+
+          mailPollingAttempt += 1;
+          await addLog(
+            `步骤 7：检测到邮箱轮询类失败，准备从步骤 6 重新开始（${mailPollingAttempt}/${STEP7_MAIL_POLLING_RECOVERY_MAX_ATTEMPTS}）...`,
+            'warn'
+          );
+          await rerunStep6ForStep7Recovery();
+          currentState = await getState();
+        }
+      }
+
+      if (lastMailPollingError) {
+        throw new Error(
+          `步骤 7：登录验证码流程在 ${STEP7_MAIL_POLLING_RECOVERY_MAX_ATTEMPTS} 轮邮箱轮询恢复后仍未成功。最后一次原因：${lastMailPollingError.message}`
+        );
+      }
+
+      throw new Error('步骤 7：登录验证码流程未成功完成。');
+    }
+
+    return { executeStep7 };
+  }
+
+  return { createStep7Executor };
+});