fix(developers): configure Mailcow API key and fix password2 field

Add the Mailcow read/write API key so mailbox provisioning actually
authenticates. Also set password2 to match password as required by
the Mailcow API.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

BlazorApp/Services/ProvisioningService.cs

@@ -108,13 +108,14 @@ public class ProvisioningService
         try
         {
             var client = _httpClientFactory.CreateClient("Mailcow");
+            var tempPassword = Guid.NewGuid().ToString("N")[..16] + "!A1";
             var payload = new
             {
                 local_part = username,
                 domain = "silverlabs.uk",
                 name = fullName,
-                password = Guid.NewGuid().ToString("N")[..16] + "!A1", // Temporary password
-                password2 = "",
+                password = tempPassword,
+                password2 = tempPassword,
                 quota = 1024, // 1GB
                 active = 1,
                 force_pw_update = 1

BlazorApp/appsettings.json

@@ -16,7 +16,7 @@
   },
   "Mailcow": {
     "BaseUrl": "https://mail.silverlined.uk",
-    "ApiKey": ""
+    "ApiKey": "2A21AA-47E4E5-46DD62-A650F0-BC7566"
   },
   "AdminApiKey": "aawb2MHblbfmqdhcS7Xp2/ibQOUbUE1BDoqdJOu0bjM="
 }