Add debug logging for raw Starface API contact data

Logs the first contact from Starface API response into the sync
log so we can see the actual JSON structure and fix field mapping.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/StarfaceOutlookSync/Services/StarfaceApiClient.cs

@@ -155,11 +155,14 @@ namespace StarfaceOutlookSync.Services
             return books;
         }
 
+        public event Action<string> OnDebug;
+
         public async Task<List<UnifiedContact>> GetContactsAsync(StarfaceAddressBook book)
         {
             var contacts = new List<UnifiedContact>();
             int page = 0;
             const int pageSize = 200;
+            bool firstPage = true;
 
             while (true)
             {
@@ -206,6 +209,13 @@ namespace StarfaceOutlookSync.Services
 
                 if (array.Count == 0) break;
 
+                // Ersten Kontakt als Debug-Info loggen
+                if (firstPage && array.Count > 0)
+                {
+                    OnDebug?.Invoke($"Starface API Rohdaten (1. Kontakt):\n{array[0].ToString(Formatting.Indented)}");
+                    firstPage = false;
+                }
+
                 foreach (var item in array)
                     contacts.Add(MapFromStarface(item));
 

src/StarfaceOutlookSync/Services/SyncEngine.cs

@@ -53,6 +53,7 @@ namespace StarfaceOutlookSync.Services
                 Log("Verbinde mit Starface...");
                 using (var starface = new StarfaceApiClient(profile.StarfaceConnection))
                 {
+                    starface.OnDebug += (msg) => Log(msg);
                     var loginOk = await starface.LoginAsync();
                     if (!loginOk)
                     {