fix(lint): use explicit safe type conversions for gosec

Use separate variables with explicit else branches to make type
conversions safe and satisfy gosec integer overflow checks.

services/audit/internal/api/server.go

@@ -120,11 +120,14 @@ func (s *Server) Query(ctx context.Context, req *auditv1.QueryRequest) (*auditv1
 	}
 
 	total := len(protoEntries)
+	var totalInt32 int32
 	if total > math.MaxInt32 {
-		total = math.MaxInt32
+		totalInt32 = math.MaxInt32
+	} else {
+		totalInt32 = int32(total)
 	}
 	return &auditv1.QueryResponse{
 		Entries: protoEntries,
-		Total:   int32(total), // Note: This is a simplified total, actual total would require a count query
+		Total:   totalInt32, // Note: This is a simplified total, actual total would require a count query
 	}, nil
 }