Add member transfer functionality to memberController and update routes and UI

Implemented a new transferMembers function in memberController to handle member transfers, including validation for transfer endpoint and template. Updated memberRoutes to include a new route for member transfers. Enhanced MembersView with a button to open a transfer dialog and integrated a MemberTransferDialog component for user interaction during the transfer process.

backend/controllers/memberController.js

@@ -1,4 +1,5 @@
 import MemberService from "../services/memberService.js";
+import MemberTransferService from "../services/memberTransferService.js";
 
 import { devLog } from '../utils/logger.js';
 const getClubMembers = async(req, res) => {
@@ -99,4 +100,36 @@ const rotateMemberImage = async (req, res) => {
     }
 };
 
-export { getClubMembers, getWaitingApprovals, setClubMembers, uploadMemberImage, getMemberImage, updateRatingsFromMyTischtennis, rotateMemberImage };
+const transferMembers = async (req, res) => {
+    try {
+        const { id: clubId } = req.params;
+        const { authcode: userToken } = req.headers;
+        const config = req.body;
+
+        // Validierung
+        if (!config.transferEndpoint) {
+            return res.status(400).json({ 
+                success: false, 
+                error: 'Übertragungs-Endpoint ist erforderlich' 
+            });
+        }
+
+        if (!config.transferTemplate) {
+            return res.status(400).json({ 
+                success: false, 
+                error: 'Übertragungs-Template ist erforderlich' 
+            });
+        }
+
+        const result = await MemberTransferService.transferMembers(userToken, clubId, config);
+        res.status(result.status).json(result.response);
+    } catch (error) {
+        console.error('[transferMembers] - Error:', error);
+        res.status(500).json({ 
+            success: false, 
+            error: 'Fehler bei der Übertragung: ' + error.message 
+        });
+    }
+};
+
+export { getClubMembers, getWaitingApprovals, setClubMembers, uploadMemberImage, getMemberImage, updateRatingsFromMyTischtennis, rotateMemberImage, transferMembers };