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

background/navigation-utils.js

@@ -4,7 +4,6 @@
   function createNavigationUtils(deps = {}) {
     const {
       DEFAULT_SUB2API_URL,
-      normalizeCpaCallbackMode,
       normalizeLocalCpaStep9Mode,
     } = deps;
 
@@ -90,11 +89,6 @@
         && isLocalCpaUrl(state?.vpsUrl);
     }
 
-    function shouldSkipLoginVerificationForCpaCallback(state) {
-      return getPanelMode(state) === 'cpa'
-        && normalizeCpaCallbackMode(state?.cpaCallbackMode) === 'step7';
-    }
-
     function matchesSourceUrlFamily(source, candidateUrl, referenceUrl) {
       const candidate = parseUrlSafely(candidateUrl);
       if (!candidate) return false;
@@ -169,7 +163,6 @@
       normalizeSub2ApiUrl,
       parseUrlSafely,
       shouldBypassStep9ForLocalCpa,
-      shouldSkipLoginVerificationForCpaCallback,
     };
   }
 

background/steps/fetch-login-code.js

@@ -22,7 +22,6 @@
       reuseOrCreateTab,
       setState,
       setStepStatus,
-      shouldSkipLoginVerificationForCpaCallback,
       shouldUseCustomRegistrationEmail,
       sleepWithStop,
       STANDARD_MAIL_VERIFICATION_RESEND_INTERVAL_MS,
@@ -127,17 +126,6 @@
     }
 
     async function executeStep8(state) {
-      if (shouldSkipLoginVerificationForCpaCallback(state)) {
-        await setState({
-          lastLoginCode: null,
-          loginVerificationRequestedAt: null,
-          oauthFlowDeadlineAt: null,
-        });
-        await setStepStatus(8, 'skipped');
-        await addLog('步骤 8：当前已选择“第七步回调”，本轮无需获取登录验证码。', 'warn');
-        return;
-      }
-
       let currentState = state;
       let mailPollingAttempt = 1;
       let lastMailPollingError = null;

background/steps/oauth-login.js

@@ -14,18 +14,12 @@
       refreshOAuthUrlBeforeStep6,
       reuseOrCreateTab,
       sendToContentScriptResilient,
-      shouldSkipLoginVerificationForCpaCallback,
-      skipLoginVerificationStepsForCpaCallback,
       startOAuthFlowTimeoutWindow,
       STEP6_MAX_ATTEMPTS,
       throwIfStopped,
     } = deps;
 
     async function executeStep7(state) {
-      if (shouldSkipLoginVerificationForCpaCallback(state)) {
-        await skipLoginVerificationStepsForCpaCallback();
-        return;
-      }
       if (!state.email) {
         throw new Error('缺少邮箱地址，请先完成步骤 3。');
       }