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/Services/DeveloperTicketParsingService.cs

@@ -0,0 +1,52 @@
+using System.Text.Json;
+using System.Text.RegularExpressions;
+
+namespace SilverLabs.Website.Services;
+
+public class DeveloperTicketParsingService
+{
+    private readonly HttpClient _httpClient;
+    private readonly ILogger<DeveloperTicketParsingService> _logger;
+
+    public DeveloperTicketParsingService(HttpClient httpClient, ILogger<DeveloperTicketParsingService> logger)
+    {
+        _httpClient = httpClient;
+        _logger = logger;
+    }
+
+    public async Task<JsonElement?> FetchTicketAsync(string ticketId)
+    {
+        try
+        {
+            var response = await _httpClient.GetAsync($"/api/tickets/{ticketId}");
+            if (!response.IsSuccessStatusCode)
+            {
+                _logger.LogError("Failed to fetch ticket {TicketId}: {Status}", ticketId, response.StatusCode);
+                return null;
+            }
+
+            var json = await response.Content.ReadAsStringAsync();
+            return JsonSerializer.Deserialize<JsonElement>(json);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error fetching ticket {TicketId}", ticketId);
+            return null;
+        }
+    }
+
+    public (string? FullName, string? Email, string? DesiredUsername) ParseApplicationFromDescription(string description)
+    {
+        var fullName = ExtractField(description, @"\*\*Full Name:\*\*\s*(.+)");
+        var email = ExtractField(description, @"\*\*Email:\*\*\s*(.+)");
+        var desiredUsername = ExtractField(description, @"\*\*Desired Username:\*\*\s*(.+)");
+
+        return (fullName, email, desiredUsername);
+    }
+
+    private static string? ExtractField(string text, string pattern)
+    {
+        var match = Regex.Match(text, pattern);
+        return match.Success ? match.Groups[1].Value.Trim() : null;
+    }
+}