fix: 完善腾讯验证码区域适配与 CSP 白名单

修复国内站和国际站 SDK 构造、验证容器、票据重置及动态资源加载问题，并补充认证流程回归测试。

backend/internal/handler/admin/setting_handler_audit.go

@@ -122,6 +122,9 @@ func diffSettings(before *service.SystemSettings, after *service.SystemSettings,
 	if req.TencentCaptchaCloudSecretKey != "" {
 		changed = append(changed, "tencent_captcha_cloud_secret_key")
 	}
+	if before.TencentCaptchaRegion != after.TencentCaptchaRegion {
+		changed = append(changed, "tencent_captcha_region")
+	}
 	if before.AliyunCaptchaEnabled != after.AliyunCaptchaEnabled {
 		changed = append(changed, "aliyun_captcha_enabled")
 	}