fix: harden SSRF protection for unauthenticated and user-level endpoints

- Add ValidateURLWithFetchSetting check before fetching MJ image URLs
  in RelayMidjourneyImage (unauthenticated endpoint)
- Add ValidateURLWithFetchSetting check before fetching video URLs
  in VideoProxy (upstream-controlled URL)
- Enable ApplyIPFilterForDomain by default to prevent DNS rebinding
  bypass of SSRF protection
- Elevate FetchModels endpoint from AdminAuth to RootAuth
- Update frontend: mark domain IP filtering as recommended, update
  description and i18n translations (zh-CN/zh-TW/en/fr/ja/ru/vi)

controller/video_proxy.go

@@ -10,10 +10,12 @@ import (
 	"strings"
 	"time"
 
+	"github.com/QuantumNous/new-api/common"
 	"github.com/QuantumNous/new-api/constant"
 	"github.com/QuantumNous/new-api/logger"
 	"github.com/QuantumNous/new-api/model"
 	"github.com/QuantumNous/new-api/service"
+	"github.com/QuantumNous/new-api/setting/system_setting"
 
 	"github.com/gin-gonic/gin"
 )
@@ -127,6 +129,13 @@ func VideoProxy(c *gin.Context) {
 		return
 	}
 
+	fetchSetting := system_setting.GetFetchSetting()
+	if err := common.ValidateURLWithFetchSetting(videoURL, fetchSetting.EnableSSRFProtection, fetchSetting.AllowPrivateIp, fetchSetting.DomainFilterMode, fetchSetting.IpFilterMode, fetchSetting.DomainList, fetchSetting.IpList, fetchSetting.AllowedPorts, fetchSetting.ApplyIPFilterForDomain); err != nil {
+		logger.LogError(c.Request.Context(), fmt.Sprintf("Video URL blocked for task %s: %v", taskID, err))
+		videoProxyError(c, http.StatusForbidden, "server_error", fmt.Sprintf("request blocked: %v", err))
+		return
+	}
+
 	req.URL, err = url.Parse(videoURL)
 	if err != nil {
 		logger.LogError(c.Request.Context(), fmt.Sprintf("Failed to parse URL %s: %s", videoURL, err.Error()))