fix: 문의 폼 제출과 텔레그램 추적 로그 개선

TaxBaik.Web/Pages/Contact.cshtml

@@ -16,6 +16,7 @@
     }
 
     <form method="post">
+        @Html.AntiForgeryToken()
         <div asp-validation-summary="ModelOnly" class="text-danger mb-3"></div>
 
         <div class="mb-3">

TaxBaik.Web/Services/TelegramInquiryNotificationService.cs

@@ -1,5 +1,6 @@
 using System.Net.Http.Json;
 using System.Text;
+using System.Text.Json;
 using TaxBaik.Application.Services;
 
 namespace TaxBaik.Web.Services;
@@ -60,13 +61,14 @@ public class TelegramInquiryNotificationService : IInquiryNotificationService
         try
         {
             var response = await client.PostAsJsonAsync(url, payload, ct);
+            var responseBody = await response.Content.ReadAsStringAsync(ct);
             if (!response.IsSuccessStatusCode)
             {
-                _logger.LogWarning("텔레그램 알림 전송 실패: {StatusCode}", response.StatusCode);
+                _logger.LogWarning("텔레그램 알림 전송 실패: {StatusCode} {ResponseBody}", response.StatusCode, Truncate(responseBody));
             }
             else
             {
-                _logger.LogInformation("텔레그램 새 문의 알림 전송 성공: #{InquiryId}", inquiryId);
+                _logger.LogInformation("텔레그램 새 문의 알림 전송 성공: #{InquiryId}, message_id={MessageId}", inquiryId, TryGetMessageId(responseBody));
             }
         }
         catch (Exception ex)
@@ -111,13 +113,14 @@ public class TelegramInquiryNotificationService : IInquiryNotificationService
         try
         {
             var response = await client.PostAsJsonAsync(url, payload, ct);
+            var responseBody = await response.Content.ReadAsStringAsync(ct);
             if (!response.IsSuccessStatusCode)
             {
-                _logger.LogWarning("텔레그램 상태 변경 알림 실패: {StatusCode}", response.StatusCode);
+                _logger.LogWarning("텔레그램 상태 변경 알림 실패: {StatusCode} {ResponseBody}", response.StatusCode, Truncate(responseBody));
             }
             else
             {
-                _logger.LogInformation("텔레그램 상태 변경 알림 전송 성공: #{InquiryId}", inquiryId);
+                _logger.LogInformation("텔레그램 상태 변경 알림 전송 성공: #{InquiryId}, message_id={MessageId}", inquiryId, TryGetMessageId(responseBody));
             }
         }
         catch (Exception ex)
@@ -133,4 +136,26 @@ public class TelegramInquiryNotificationService : IInquiryNotificationService
         "completed" => "완료",
         _ => status
     };
+
+    private static string TryGetMessageId(string responseBody)
+    {
+        try
+        {
+            using var document = JsonDocument.Parse(responseBody);
+            if (document.RootElement.TryGetProperty("result", out var result)
+                && result.TryGetProperty("message_id", out var messageId))
+            {
+                return messageId.ToString();
+            }
+        }
+        catch (JsonException)
+        {
+            return "unknown";
+        }
+
+        return "unknown";
+    }
+
+    private static string Truncate(string value)
+        => value.Length <= 500 ? value : value[..500] + "...";
 }