Replace timestamp-based IDs with UUIDs for guaranteed uniqueness and race condition safety

server/data/members.json

@@ -1,6 +1,6 @@
 [
   {
-    "id": "m1",
+    "id": "550e8400-e29b-41d4-a716-446655440001",
     "firstName": "Max",
     "lastName": "Mustermann",
     "email": "max@example.com",
@@ -9,7 +9,7 @@
     "notes": "Herren 1"
   },
   {
-    "id": "m2",
+    "id": "550e8400-e29b-41d4-a716-446655440002",
     "firstName": "Anna",
     "lastName": "Schmidt",
     "email": "",

server/data/news.json

@@ -1,14 +1,6 @@
 [
   {
-    "id": "n1729515536050",
-    "title": "aaa",
-    "content": "bbb",
-    "author": "Admin",
-    "created": "2025-10-21T13:08:56.050Z",
-    "updated": "2025-10-21T13:08:56.050Z"
-  },
-  {
-    "id": "n1729514969710",
+    "id": "660e8400-e29b-41d4-a716-446655440001",
     "title": "Alles neu",
     "content": "Die seite ist brandneu",
     "author": "Admin",
@@ -16,11 +8,11 @@
     "updated": "2025-10-21T12:49:29.710Z"
   },
   {
-    "id": "n1",
+    "id": "660e8400-e29b-41d4-a716-446655440002",
     "title": "Willkommen im Mitgliederbereich",
     "content": "Hier finden Sie ab sofort alle internen Neuigkeiten und Ankündigungen des Harheimer TC.",
     "author": "Vorstand",
     "created": "2025-01-15T10:00:00.000Z",
     "updated": "2025-01-15T10:00:00.000Z"
   }
-]
+]