feat(developers): create DeveloperApplication record on signup

After registering the user and creating the ticket, call the
SilverDESK developer-program API to create a proper application
record linking the user and ticket. This ensures applications
appear in the /developer-program/applications dashboard.

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

BlazorApp/Services/DeveloperApplicationService.cs

@@ -86,6 +86,48 @@ public class DeveloperApplicationService
                 return (true, "Your account has been created, but we had trouble submitting your application ticket. Please log in to SilverDESK and create a support ticket.", token);
             }
 
+            // 3. Create DeveloperApplication record linking user + ticket
+            try
+            {
+                var userId = authResult.GetProperty("user").GetProperty("id").GetString();
+                var ticketResult = await ticketResponse.Content.ReadFromJsonAsync<JsonElement>();
+                var ticketId = ticketResult.GetProperty("id").GetInt32();
+
+                var applicationPayload = new
+                {
+                    userId,
+                    ticketId,
+                    fullName = application.FullName,
+                    email = application.Email,
+                    desiredUsername = application.DesiredUsername,
+                    timezone = application.Timezone,
+                    appliedRole = (int)application.Role,
+                    platforms = application.Platforms,
+                    skills = application.Skills ?? "",
+                    motivation = application.Motivation,
+                    status = 0, // Pending
+                    silverDeskProvisioned = true
+                };
+
+                var appResponse = await _httpClient.PostAsJsonAsync("/api/developer-program/applications", applicationPayload);
+
+                if (appResponse.IsSuccessStatusCode)
+                {
+                    _logger.LogInformation("DeveloperApplication record created for {Email}", application.Email);
+                }
+                else
+                {
+                    var appError = await appResponse.Content.ReadAsStringAsync();
+                    _logger.LogWarning("Failed to create DeveloperApplication record for {Email}: {StatusCode} - {Body}",
+                        application.Email, appResponse.StatusCode, appError);
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.LogWarning(ex, "Failed to create DeveloperApplication record for {Email} — user and ticket were created successfully",
+                    application.Email);
+            }
+
             _logger.LogInformation("Developer application submitted for {Email} as {Role} — user registered and ticket created",
                 application.Email, application.Role);