fix(captcha): 1:1 align bind-phone and real status contracts

Add bind_phone captcha scene across schema/runtime/UI, require captcha on
phone bind, return real captcha status objects instead of legacy option
aliases, and harden form discovery for page-sign auth forms.

inc/classes/auth-traits/trait-aksrt-auth-service-part-1b.php

@@ -425,6 +425,13 @@ trait AKSRT_Auth_Service_Part_1b {
 			return ['success' => false, 'error' => __('手机号格式不正确', 'aksrt')];
 		}
 
+		if (function_exists('aksrt_require_captcha')) {
+			$captcha_result = aksrt_require_captcha('bind_phone', $post);
+			if ($captcha_result !== true) {
+				return ['success' => false, 'error' => $captcha_result];
+			}
+		}
+
 		// 验证 SMS 验证码
 		if (class_exists('AKSRT_SMS')) {
 			$verify_result = AKSRT_SMS::get_instance()->verify_code($phone, $code);