chore(repo): initialize WebDrop monorepo

Signed-off-by: JustMe <mr.toing@outlook.com>

packages/core/package.json

@@ -0,0 +1,39 @@
+{
+  "name": "@webdrop/core",
+  "version": "0.1.0",
+  "description": "WebDrop 端到端加密核心:密钥派生、帧加解密、条目装配、链接。只依赖 WebCrypto,无 UI、无网络。",
+  "type": "module",
+  "sideEffects": false,
+  "license": "UNLICENSED",
+  "private": true,
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    },
+    "./internal": {
+      "types": "./dist/internal.d.ts",
+      "import": "./dist/internal.js"
+    }
+  },
+  "files": [
+    "dist"
+  ],
+  "engines": {
+    "node": ">=22"
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.build.json",
+    "typecheck": "tsc -p tsconfig.json --noEmit && tsc -p tsconfig.build.json --noEmit",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "vectors:check": "node ../../test-vectors/generate.mjs --check"
+  },
+  "devDependencies": {
+    "@types/node": "^26.6.3",
+    "typescript": "^7.0.2",
+    "vitest": "^5.0.3"
+  }
+}