feat(email): export send attempt metadata

Add content-free provider delivery history to encrypted and daily owner exports, exclude payload hashes, and lock in tenant-safe hard-delete cascades.

JobTrackerApi/Controllers/BackupController.cs

@@ -5,6 +5,7 @@ using Microsoft.AspNetCore.DataProtection;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using JobTrackerApi.Data;
+using JobTrackerApi.Models;
 
 namespace JobTrackerApi.Controllers
 {
@@ -73,6 +74,21 @@ namespace JobTrackerApi.Controllers
                 .Where(e => jobIds.Contains(e.JobApplicationId))
                 .OrderBy(e => e.At)
                 .ToListAsync(cancellationToken);
+            var emailSendAttempts = await _db.EmailSendAttempts.AsNoTracking()
+                .Where(attempt => jobIds.Contains(attempt.JobApplicationId))
+                .OrderBy(attempt => attempt.CreatedAtUtc)
+                .Select(attempt => new EmailSendAttemptExport(
+                    attempt.Id,
+                    attempt.JobApplicationId,
+                    attempt.Provider,
+                    attempt.ClientRequestId,
+                    attempt.Status,
+                    attempt.ProviderMessageId,
+                    attempt.FailureCategory,
+                    attempt.CreatedAtUtc,
+                    attempt.StartedAtUtc,
+                    attempt.CompletedAtUtc))
+                .ToListAsync(cancellationToken);
             var rules = await _db.RuleSettings.AsNoTracking().FirstOrDefaultAsync(cancellationToken);
 
             return new
@@ -82,6 +98,7 @@ namespace JobTrackerApi.Controllers
                 Correspondence = correspondence,
                 Attachments = attachments,
                 Events = events,
+                EmailSendAttempts = emailSendAttempts,
                 Rules = rules
             };
         }