fix(backend): sync user tunnel status and relax forward speedId permission check

- Return actual user_tunnel.status in admin permission list instead of hardcoded 1
- Allow non-admin users to update forwards when keeping the same speedId selection
- Add contract tests for user tunnel status mapping and forward permission edge case

Entire-Checkpoint: deb90fb942ee

go-backend/internal/http/handler/handler.go

@@ -571,7 +571,7 @@ func (h *Handler) userTunnelList(w http.ResponseWriter, r *http.Request) {
 			"userId":         t.UserID,
 			"tunnelId":       t.TunnelID,
 			"tunnelName":     t.TunnelName,
-			"status":         1,
+			"status":         t.Status,
 			"flow":           t.Flow,
 			"num":            t.Num,
 			"expTime":        t.ExpTime,

go-backend/internal/http/handler/mutations.go

@@ -1279,13 +1279,13 @@ func (h *Handler) forwardUpdate(w http.ResponseWriter, r *http.Request) {
 	if strategy == "" {
 		strategy = forward.Strategy
 	}
-	if actorRole != 0 {
-		if speedIDVal, ok := req["speedId"]; ok && speedIDVal != nil {
-			response.WriteJSON(w, response.Err(-1, "普通用户无法修改限速规则"))
-			return
-		}
+	rawSpeedID, hasSpeedID := req["speedId"]
+	requestedSpeedID := asAnyToInt64Ptr(rawSpeedID)
+	if actorRole != 0 && hasSpeedID && requestedSpeedID != nil && !sameSpeedLimitSelection(forward.SpeedID, requestedSpeedID) {
+		response.WriteJSON(w, response.Err(-1, "普通用户无法修改限速规则"))
+		return
 	}
-	speedID := asAnyToInt64Ptr(req["speedId"])
+	speedID := requestedSpeedID
 	speedID, err = h.normalizeSpeedLimitReference(speedID)
 	if err != nil {
 		response.WriteJSON(w, response.Err(-2, err.Error()))
@@ -3380,6 +3380,14 @@ func (h *Handler) normalizeSpeedLimitReference(speedID *int64) (*int64, error) {
 	return speedID, nil
 }
 
+func sameSpeedLimitSelection(current sql.NullInt64, requested *int64) bool {
+	if requested == nil {
+		return !current.Valid
+	}
+
+	return current.Valid && current.Int64 == *requested
+}
+
 func asAnySlice(v interface{}) []interface{} {
 	if v == nil {
 		return nil