fix: cannot find the package after building and the problem during the building

Author: oneWalker

package.json

@@ -11,12 +11,14 @@
     "bin": {
         "openapi-mcp-generator": "./bin/openapi-mcp-generator.js"
     },
+    "main": "dist/index.js",
     "files": [
         "dist",
         "bin",
         "README.md",
         "LICENSE"
     ],
+    "types": "./dist/index.d.ts",
     "scripts": {
         "start": "node dist/index.js",
         "clean": "rimraf dist",