feat: support Wan2.7 i2v media mapping (#4984)

* feat: support Wan2.7 i2v media mapping

* fix: normalize wan2.7 i2v image inputs

relay/common/relay_utils.go

@@ -139,6 +139,9 @@ func ValidateMultipartDirect(c *gin.Context, info *RelayInfo) *dto.TaskError {
 	}
 	if req.InputReference != "" {
 		req.Images = []string{req.InputReference}
+	} else if len(req.Images) == 0 && strings.TrimSpace(req.Image) != "" {
+		// 兼容单图上传
+		req.Images = []string{strings.TrimSpace(req.Image)}
 	}
 
 	if strings.TrimSpace(req.Model) == "" {

relay/common/relay_utils_test.go

@@ -0,0 +1,33 @@
+package common
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/QuantumNous/new-api/constant"
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/require"
+)
+
+func TestValidateMultipartDirectNormalizesImageField(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	body := strings.NewReader(`{"model":"wan2.7-i2v","prompt":"animate","image":" https://example.com/first.png "}`)
+	request := httptest.NewRequest(http.MethodPost, "/v1/video/generations", body)
+	request.Header.Set("Content-Type", "application/json")
+	recorder := httptest.NewRecorder()
+	context, _ := gin.CreateTestContext(recorder)
+	context.Request = request
+	info := &RelayInfo{
+		TaskRelayInfo: &TaskRelayInfo{},
+	}
+
+	taskErr := ValidateMultipartDirect(context, info)
+
+	require.Nil(t, taskErr)
+	storedReq, err := GetTaskRequest(context)
+	require.NoError(t, err)
+	require.Equal(t, []string{"https://example.com/first.png"}, storedReq.Images)
+	require.Equal(t, constant.TaskActionGenerate, info.Action)
+}