refactor: establish unified viewer workspaces

package.json

@@ -1,23 +1,22 @@
 {
-  "name": "dwg-dxf-viewer-sample",
+  "name": "hmwebviewer-workspace",
   "private": true,
-  "version": "0.1.0",
-  "description": "Standalone sample: compose acadrust-dwg + dxf-parser + Viewer2D (sibling of hmwebviewer)",
+  "version": "0.2.0",
   "type": "module",
   "workspaces": [
+    "apps/*",
     "packages/*"
   ],
   "scripts": {
-    "dev": "vite --port 5173 --strictPort",
-    "build": "tsc --noEmit && vite build",
-    "preview": "vite preview",
-    "typecheck": "tsc --noEmit",
-    "test": "vitest run",
-    "test:unit": "vitest run tests/viewer2d.contract.test.ts"
-  },
-  "dependencies": {
-    "@hmwebviewer/viewer2d": "workspace:*",
-    "three": "0.185.1"
+    "dev:2d": "npm --workspace @hmwebviewer/viewer-2d-sample run dev",
+    "dev:3d": "npm --workspace @hmwebviewer/viewer-3d run dev",
+    "build": "npm run build --workspaces --if-present",
+    "typecheck": "npm run typecheck --workspaces --if-present",
+    "test": "npm run test:unit",
+    "test:unit": "vitest run",
+    "test:e2e": "playwright test",
+    "verify": "npm run typecheck && npm run test:unit && npm run build && npm run test:e2e",
+    "postinstall": "npm --workspace @hmwebviewer/viewer-3d run stage:decoders"
   },
   "devDependencies": {
     "@playwright/test": "1.62.0",
@@ -25,5 +24,9 @@
     "typescript": "7.0.2",
     "vite": "8.1.5",
     "vitest": "4.1.10"
+  },
+  "engines": {
+    "node": ">=24.0.0",
+    "npm": ">=11.0.0"
   }
 }