feat: notify inquiry status changes

TaxBaik.Application.Tests/InquiryServiceTests.cs

@@ -61,5 +61,8 @@ public class InquiryServiceTests
     {
         public Task NotifyCreatedAsync(int inquiryId, string name, string phone, string serviceType, string message, CancellationToken ct = default)
             => Task.CompletedTask;
+
+        public Task NotifyStatusChangedAsync(int inquiryId, string name, string phone, string serviceType, string previousStatus, string newStatus, CancellationToken ct = default)
+            => Task.CompletedTask;
     }
 }

TaxBaik.Application/Services/IInquiryNotificationService.cs

@@ -3,4 +3,5 @@ namespace TaxBaik.Application.Services;
 public interface IInquiryNotificationService
 {
     Task NotifyCreatedAsync(int inquiryId, string name, string phone, string serviceType, string message, CancellationToken ct = default);
+    Task NotifyStatusChangedAsync(int inquiryId, string name, string phone, string serviceType, string previousStatus, string newStatus, CancellationToken ct = default);
 }

TaxBaik.Application/Services/InquiryService.cs

@@ -51,7 +51,15 @@ public class InquiryService(IInquiryRepository repository, IInquiryNotificationS
         if (!InquiryStatusMapper.TryParse(status, out var parsed))
             throw new ValidationException("지원하지 않는 문의 상태입니다.");
 
-        await repository.UpdateStatusAsync(id, InquiryStatusMapper.ToStorageValue(parsed), ct);
+        var inquiry = await repository.GetByIdAsync(id, ct);
+        if (inquiry == null)
+            return;
+
+        var previousStatus = inquiry.Status;
+        var newStatus = InquiryStatusMapper.ToStorageValue(parsed);
+
+        await repository.UpdateStatusAsync(id, newStatus, ct);
+        await notificationService.NotifyStatusChangedAsync(id, inquiry.Name, inquiry.Phone, inquiry.ServiceType, previousStatus, newStatus, ct);
     }
 
     private static int NormalizePage(int page) => Math.Max(1, page);

TaxBaik.Application/Services/NoopInquiryNotificationService.cs

@@ -4,4 +4,7 @@ public sealed class NoopInquiryNotificationService : IInquiryNotificationService
 {
     public Task NotifyCreatedAsync(int inquiryId, string name, string phone, string serviceType, string message, CancellationToken ct = default)
         => Task.CompletedTask;
+
+    public Task NotifyStatusChangedAsync(int inquiryId, string name, string phone, string serviceType, string previousStatus, string newStatus, CancellationToken ct = default)
+        => Task.CompletedTask;
 }

TaxBaik.Web/Services/TelegramInquiryNotificationService.cs

@@ -61,4 +61,44 @@ public class TelegramInquiryNotificationService : IInquiryNotificationService
             _logger.LogWarning(ex, "텔레그램 알림 전송 중 오류 발생");
         }
     }
+
+    public async Task NotifyStatusChangedAsync(int inquiryId, string name, string phone, string serviceType, string previousStatus, string newStatus, CancellationToken ct = default)
+    {
+        var botToken = _configuration["Telegram:BotToken"];
+        var chatId = _configuration["Telegram:ChatId"];
+        if (string.IsNullOrWhiteSpace(botToken) || string.IsNullOrWhiteSpace(chatId))
+            return;
+
+        var adminLink = $"{_baseUrl}/admin/inquiries/{inquiryId}";
+        var text = new StringBuilder()
+            .AppendLine("문의 상태가 변경되었습니다.")
+            .AppendLine()
+            .AppendLine($"제목: {serviceType}")
+            .AppendLine($"이름: {name}")
+            .AppendLine($"연락처: {phone}")
+            .AppendLine($"상태: {previousStatus} -> {newStatus}")
+            .AppendLine()
+            .AppendLine($"답변 링크: {adminLink}")
+            .ToString();
+
+        var client = _httpClientFactory.CreateClient();
+        var url = $"https://api.telegram.org/bot{botToken}/sendMessage";
+        var payload = new
+        {
+            chat_id = chatId,
+            text,
+            disable_web_page_preview = false
+        };
+
+        try
+        {
+            var response = await client.PostAsJsonAsync(url, payload, ct);
+            if (!response.IsSuccessStatusCode)
+                _logger.LogWarning("텔레그램 상태 변경 알림 실패: {StatusCode}", response.StatusCode);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogWarning(ex, "텔레그램 상태 변경 알림 중 오류 발생");
+        }
+    }
 }