Merge pull request #1553 from feitianbubu/pr/add-jimeng-officail-api

feat: add jimeng video official api

middleware/distributor.go

@@ -174,7 +174,9 @@ func getModelRequest(c *gin.Context) (*ModelRequest, bool, error) {
 			relayMode = relayconstant.RelayModeVideoFetchByID
 			shouldSelectChannel = false
 		}
-		c.Set("relay_mode", relayMode)
+		if _, ok := c.Get("relay_mode"); !ok {
+			c.Set("relay_mode", relayMode)
+		}
 	} else if strings.HasPrefix(c.Request.URL.Path, "/v1beta/models/") || strings.HasPrefix(c.Request.URL.Path, "/v1/models/") {
 		// Gemini API 路径处理: /v1beta/models/gemini-2.0-flash:generateContent
 		relayMode := relayconstant.RelayModeGemini