feat(tree): implement tree component with checkbox support and manager pattern

- Added core Tree component (BimTree, BimTreeNode)
- Added TreeManager for lifecycle management
- Added ModelTreeManager for business logic encapsulation (Tree + Dialog)
- Integrated into BimEngine and updated demos
- Added internationalization support

src/locales/en-US.ts

@@ -22,7 +22,16 @@ export const enUS: TranslationDictionary = {
     testContent: '<div style="padding: 10px;">This is a <b>draggable</b> and <b>resizable</b> dialog.<br><br>Try dragging the title bar or resizing from the bottom-right corner.</div>',
   },
   menu: {
-    info: "info",
-    home: "home",
+    info: 'Info',
+    home: 'Home',
+  },
+  tree: {
+    modelStruct: 'Model Structure',
+    floor1: 'Level 1',
+    floor2: 'Level 2',
+    wall: 'Walls',
+    column: 'Columns',
+    window: 'Windows',
+    door: 'Doors',
   }
 };