feat: 移除CPA回调相关逻辑，固定为步骤9，更新文档以反映新流程

tests/auto-run-step4-restart.test.js

@@ -143,9 +143,6 @@ async function getTabId() {
   return 1;
 }
 
-function shouldSkipLoginVerificationForCpaCallback() {
-  return false;
-}
 
 async function invalidateDownstreamAfterStepRestart(step, options = {}) {
   events.invalidations.push({ step, options });

tests/auto-run-step6-restart.test.js

@@ -114,9 +114,6 @@ async function executeStepAndWait(step) {
 async function getTabId() {
   return 1;
 }
-function shouldSkipLoginVerificationForCpaCallback() {
-  return false;
-}
 async function invalidateDownstreamAfterStepRestart(step, options = {}) {
   events.invalidations.push({ step, options });
 }

tests/background-account-history-settings.test.js

@@ -71,10 +71,6 @@ const PERSISTED_SETTING_DEFAULTS = {
 };
 function normalizePanelMode(value) { return value === 'sub2api' ? 'sub2api' : 'cpa'; }
 function normalizeLocalCpaStep9Mode(value) { return value === 'bypass' ? 'bypass' : 'submit'; }
-function normalizeCpaCallbackMode(value) {
-  if (value === 'step7' || value === 'step6') return 'step7';
-  return value === 'step9' || value === 'step8' ? 'step9' : 'step9';
-}
 function normalizeAutoRunFallbackThreadIntervalMinutes(value) { return Number(value) || 0; }
 function normalizeAutoRunDelayMinutes(value) { return Number(value) || 30; }
 function normalizeAutoStepDelaySeconds(value) { return value == null || value === '' ? null : Number(value); }

tests/background-step6-retry-limit.test.js

@@ -61,8 +61,6 @@ test('step 7 retries up to configured limit and then fails', async () => {
         message: '当前仍停留在邮箱页。',
       };
     },
-    shouldSkipLoginVerificationForCpaCallback: () => false,
-    skipLoginVerificationStepsForCpaCallback: async () => {},
     STEP6_MAX_ATTEMPTS: 3,
     throwIfStopped: () => {},
   });
@@ -105,8 +103,6 @@ test('step 7 starts a new oauth timeout window for each refreshed oauth url', as
       step6Outcome: 'success',
       usedTimeoutMs: options.timeoutMs,
     }),
-    shouldSkipLoginVerificationForCpaCallback: () => false,
-    skipLoginVerificationStepsForCpaCallback: async () => {},
     startOAuthFlowTimeoutWindow: async (payload) => {
       events.startedWindows.push(payload);
     },

tests/background-step7-recovery.test.js

@@ -55,7 +55,6 @@ test('step 8 submits login verification directly without replaying step 7', asyn
     reuseOrCreateTab: async () => {},
     setState: async () => {},
     setStepStatus: async () => {},
-    shouldSkipLoginVerificationForCpaCallback: () => false,
     shouldUseCustomRegistrationEmail: () => false,
     sleepWithStop: async (ms) => {
       calls.sleep.push(ms);
@@ -123,7 +122,6 @@ test('step 8 disables resend interval for 2925 mailbox polling', async () => {
     reuseOrCreateTab: async () => {},
     setState: async () => {},
     setStepStatus: async () => {},
-    shouldSkipLoginVerificationForCpaCallback: () => false,
     shouldUseCustomRegistrationEmail: () => false,
     sleepWithStop: async () => {},
     STANDARD_MAIL_VERIFICATION_RESEND_INTERVAL_MS: 25000,