fix: invite handler used creator_id but DB column is created_by

internal/invite/handlers.go

@@ -40,7 +40,7 @@ type inviteResponse struct {
 	Code       string  `json:"code"`
 	ServerID   string  `json:"server_id"`
 	ServerName string  `json:"server_name"`
-	CreatorID  string  `json:"creator_id"`
+	CreatorID  string  `json:"created_by"`
 	MaxUses    *int    `json:"max_uses"`
 	UseCount   int     `json:"use_count"`
 	ExpiresAt  *string `json:"expires_at"`
@@ -145,9 +145,9 @@ func (h *Handler) Create(w http.ResponseWriter, r *http.Request) {
 	var createdAtStr sql.NullString
 
 	err = h.db.QueryRowContext(r.Context(), `
-		INSERT INTO invites (code, server_id, creator_id, max_uses, expires_at)
+		INSERT INTO invites (code, server_id, created_by, max_uses, expires_at)
 		VALUES ($1, $2, $3, $4, $5)
-		RETURNING id, code, server_id, creator_id, max_uses, use_count, expires_at::text, created_at::text
+		RETURNING id, code, server_id, created_by, max_uses, use_count, expires_at::text, created_at::text
 	`, code, serverID, userID, maxUses, expiresAt).Scan(
 		&invite.ID, &invite.Code, &invite.ServerID, &invite.CreatorID,
 		&invite.MaxUses, &invite.UseCount, &expiresAtStr, &createdAtStr,
@@ -191,7 +191,7 @@ func (h *Handler) Get(w http.ResponseWriter, r *http.Request) {
 	var createdAtStr sql.NullString
 
 	err := h.db.QueryRowContext(r.Context(), `
-		SELECT i.id, i.code, i.server_id, COALESCE(s.name, ''), i.creator_id,
+		SELECT i.id, i.code, i.server_id, COALESCE(s.name, ''), i.created_by,
 			   i.max_uses, i.use_count, i.expires_at::text, i.created_at::text
 		FROM invites i
 		LEFT JOIN servers s ON s.id = i.server_id