feat(editor): integrate excalidraw with server file upload/update

- Update @haklex/* packages to 0.0.54
- Add ExcalidrawConfigProvider with saveSnapshot and apiUrl
- Implement saveExcalidrawSnapshot with update-in-place support
- Add filesApi.update for PUT /files/:type/:name
- Fix RichDiffBridge: TldrawNode → ExcalidrawNode
- Alias excalidraw to production build for Vite compatibility

Author: Innei

package.json

@@ -41,11 +41,11 @@
     "@codemirror/view": "6.39.11",
     "@ddietr/codemirror-themes": "1.5.2",
     "@emoji-mart/data": "1.2.1",
-    "@haklex/rich-diff": "0.0.47",
-    "@haklex/rich-editor": "0.0.47",
-    "@haklex/rich-editor-ui": "0.0.47",
-    "@haklex/rich-kit-shiro": "0.0.47",
-    "@haklex/rich-style-token": "0.0.47",
+    "@haklex/rich-diff": "0.0.54",
+    "@haklex/rich-editor": "0.0.54",
+    "@haklex/rich-editor-ui": "0.0.54",
+    "@haklex/rich-kit-shiro": "0.0.54",
+    "@haklex/rich-style-token": "0.0.54",
     "@lexical/markdown": "0.41.0",
     "@lexical/react": "0.41.0",
     "@lezer/highlight": "1.2.3",