fix: return messages in chronological order (oldest first)

internal/message/handlers.go

@@ -311,7 +311,7 @@ func (h *Handler) List(w http.ResponseWriter, r *http.Request) {
 			FROM messages m
 			JOIN users u ON m.author_id = u.id
 			WHERE m.channel_id = $1 AND m.created_at < (SELECT created_at FROM messages WHERE id = $2)
-			ORDER BY m.created_at DESC
+			ORDER BY m.created_at ASC
 			LIMIT $3
 		`, channelID, before, limit)
 	} else {
@@ -320,7 +320,7 @@ func (h *Handler) List(w http.ResponseWriter, r *http.Request) {
 			FROM messages m
 			JOIN users u ON m.author_id = u.id
 			WHERE m.channel_id = $1
-			ORDER BY m.created_at DESC
+			ORDER BY m.created_at ASC
 			LIMIT $2
 		`, channelID, limit)
 	}