Fix build and run issues

internal/notification/notification.go

@@ -14,7 +14,7 @@ type Notification struct {
 	ID          int64     `json:"id"`
 	VolunteerID int64     `json:"volunteer_id"`
 	Message     string    `json:"message"`
-	Read        bool      `json:"read"`
+	Read        bool      `json:"is_read"`
 	CreatedAt   time.Time `json:"created_at"`
 }
 
@@ -42,7 +42,7 @@ func (s *Store) GetByID(ctx context.Context, id int64) (*Notification, error) {
 	n := &Notification{}
 	var createdAt string
 	err := s.db.QueryRowContext(ctx,
-		`SELECT id, volunteer_id, message, read, created_at FROM notifications WHERE id = ?`, id,
+		`SELECT id, volunteer_id, message, is_read, created_at FROM notifications WHERE id = ?`, id,
 	).Scan(&n.ID, &n.VolunteerID, &n.Message, &n.Read, &createdAt)
 	if errors.Is(err, sql.ErrNoRows) {
 		return nil, ErrNotFound
@@ -56,7 +56,7 @@ func (s *Store) GetByID(ctx context.Context, id int64) (*Notification, error) {
 
 func (s *Store) ListForVolunteer(ctx context.Context, volunteerID int64) ([]Notification, error) {
 	rows, err := s.db.QueryContext(ctx,
-		`SELECT id, volunteer_id, message, read, created_at FROM notifications WHERE volunteer_id = ? ORDER BY created_at DESC`,
+		`SELECT id, volunteer_id, message, is_read, created_at FROM notifications WHERE volunteer_id = ? ORDER BY created_at DESC`,
 		volunteerID,
 	)
 	if err != nil {
@@ -85,7 +85,7 @@ func (s *Store) CreateNotification(ctx context.Context, volunteerID int64, messa
 
 func (s *Store) MarkRead(ctx context.Context, id, volunteerID int64) (*Notification, error) {
 	result, err := s.db.ExecContext(ctx,
-		`UPDATE notifications SET read = 1 WHERE id = ? AND volunteer_id = ?`,
+		`UPDATE notifications SET is_read = 1 WHERE id = ? AND volunteer_id = ?`,
 		id, volunteerID,
 	)
 	if err != nil {