feat(developers): fix approval webhook flow and add ticket parsing service

Change approve endpoint from int to string ticketId to match SilverDESK
GUIDs. Remove body parameter requirement so the endpoint works as a
webhook target. Add DeveloperTicketParsingService to fetch and parse
applicant details from ticket descriptions. Remove redundant ticket
status update from ProvisioningService since SilverDESK action engine
now handles SetStatus/AddNote/AddReply steps.

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

BlazorApp/Endpoints/DeveloperEndpoints.cs

@@ -17,10 +17,10 @@ public static class DeveloperEndpoints
                 : Results.Problem(message, statusCode: 502);
         });
 
-        group.MapPost("/approve/{ticketId:int}", async (
-            int ticketId,
-            ApproveRequest request,
-            ProvisioningService service,
+        group.MapPost("/approve/{ticketId}", async (
+            string ticketId,
+            DeveloperTicketParsingService ticketService,
+            ProvisioningService provisioningService,
             HttpContext context,
             IConfiguration config) =>
         {
@@ -30,8 +30,18 @@ public static class DeveloperEndpoints
             if (string.IsNullOrEmpty(expectedKey) || apiKey != expectedKey)
                 return Results.Unauthorized();
 
-            var (success, message) = await service.ApproveApplicationAsync(
-                ticketId, request.Username, request.Email, request.FullName);
+            var ticket = await ticketService.FetchTicketAsync(ticketId);
+            if (ticket is null)
+                return Results.Problem("Failed to fetch ticket from SilverDESK", statusCode: 502);
+
+            var description = ticket.Value.GetProperty("description").GetString() ?? "";
+            var (fullName, email, desiredUsername) = ticketService.ParseApplicationFromDescription(description);
+
+            if (string.IsNullOrEmpty(fullName) || string.IsNullOrEmpty(email) || string.IsNullOrEmpty(desiredUsername))
+                return Results.Problem("Could not parse applicant details from ticket description", statusCode: 422);
+
+            var (success, message) = await provisioningService.ApproveApplicationAsync(
+                ticketId, desiredUsername, email, fullName);
 
             return success
                 ? Results.Ok(new { message })
@@ -39,5 +49,3 @@ public static class DeveloperEndpoints
         });
     }
 }
-
-public record ApproveRequest(string Username, string Email, string FullName);