feat: add gmail review decisions

JobTrackerApi/Controllers/GmailController.cs

@@ -259,11 +259,16 @@ public sealed class GmailController : ControllerBase
             .Where(message => !string.IsNullOrWhiteSpace(message.ExternalThreadId))
             .Select(message => message.ExternalThreadId!)
             .ToHashSet(StringComparer.Ordinal);
+        var reviewDecisions = await _db.GmailReviewDecisions
+            .AsNoTracking()
+            .Where(decision => decision.OwnerUserId == ownerUserId)
+            .ToListAsync(cancellationToken);
 
         var groupedThreads = candidateMessages
             .GroupBy(message => string.IsNullOrWhiteSpace(message.Message.ThreadId) ? message.Message.Id : message.Message.ThreadId, StringComparer.Ordinal)
             .Select(group =>
             {
+                var existingDecision = reviewDecisions.FirstOrDefault(x => x.ThreadId == group.Key);
                 var orderedMessages = group.OrderByDescending(item => item.Message.Date ?? DateTimeOffset.MinValue).ToList();
                 var latestDate = orderedMessages.Max(item => item.Message.Date ?? DateTimeOffset.MinValue);
                 var subject = orderedMessages.FirstOrDefault(item => !string.IsNullOrWhiteSpace(item.Message.Subject))?.Message.Subject ?? "(no subject)";
@@ -292,11 +297,17 @@ public sealed class GmailController : ControllerBase
 
                 var topScore = jobCandidates.FirstOrDefault()?.Score ?? 0;
                 var secondScore = jobCandidates.Skip(1).FirstOrDefault()?.Score ?? 0;
-                var routing = topScore >= 30 && topScore - secondScore >= 8
-                    ? "auto-link"
-                    : topScore >= 16
-                        ? "review"
-                        : "unmatched";
+                var routing = existingDecision?.Decision switch
+                {
+                    "linked" => "linked",
+                    "rejected" => "rejected",
+                    "suggested" => "suggested",
+                    _ => topScore >= 30 && topScore - secondScore >= 8
+                        ? "auto-link"
+                        : topScore >= 16
+                            ? "review"
+                            : "unmatched"
+                };
 
                 var messages = orderedMessages
                     .Select(item => new GmailJobMatchedMessageDto(