build: experimental build with node package

um_wasm_loader/package.json

@@ -0,0 +1,45 @@
+{
+  "name": "@um/crypto",
+  "version": "0.0.0-alpha.1",
+  "description": "Project Unlock Music: 加解密支持库",
+  "scripts": {
+    "build": "node build.js",
+    "build:bundle": "rollup -c"
+  },
+  "main": "dist/loader.js",
+  "module": "dist/loader.mjs",
+  "types": "dist/loader.d.ts",
+  "exports": {
+    ".": {
+      "import": "./dist/loader.mjs",
+      "require": "./dist/loader.js",
+      "types": "./dist/loader.d.ts"
+    },
+    "./inline": {
+      "require": "./dist/loader-inline.js",
+      "import": "./dist/loader-inline.js",
+      "types": "./dist/loader.d.ts"
+    }
+  },
+  "files": [
+    "dist/",
+    "LICENSE*"
+  ],
+  "keywords": [],
+  "author": "",
+  "license": "MIT + APACHE 2.0",
+  "devDependencies": {
+    "@rollup/plugin-replace": "^5.0.7",
+    "@rollup/plugin-wasm": "^6.2.2",
+    "@types/node": "^22.5.2",
+    "prettier": "^3.3.3",
+    "rollup": "^4.21.2",
+    "rollup-plugin-dts": "^6.1.1",
+    "typescript": "^5.5.4"
+  },
+  "prettier": {
+    "singleQuote": true,
+    "printWidth": 120,
+    "tabWidth": 2
+  }
+}