refactor(packages): change package structure

packages/svelte/src/lib/container/SvelteFlow/SvelteFlow.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
   import { onMount } from 'svelte';
   import cc from 'classcat';
-  import { PanOnScrollMode, type CoordinateExtent, type Viewport } from '@reactflow/system';
+  import { PanOnScrollMode, type CoordinateExtent, type Viewport } from '@xyflow/system';
 
   import { Zoom } from '$lib/container/Zoom';
   import { Pane } from '$lib/container/Pane';

packages/svelte/src/lib/container/SvelteFlow/types.ts

@@ -13,7 +13,7 @@ import type {
   CoordinateExtent,
   PanOnScrollMode,
   IsValidConnection
-} from '@reactflow/system';
+} from '@xyflow/system';
 
 import type { Edge, Node, NodeTypes, KeyDefinition, EdgeTypes } from '$lib/types';