feat: add npm package support with CLI entry point

package.json

@@ -4,6 +4,13 @@
   "description": "Proxy server to use Antigravity's Claude models with Claude Code CLI",
   "main": "src/index.js",
   "type": "module",
+  "bin": {
+    "antigravity-proxy": "bin/cli.js"
+  },
+  "files": [
+    "src",
+    "bin"
+  ],
   "scripts": {
     "start": "node src/index.js",
     "dev": "node --watch src/index.js",
@@ -27,8 +34,19 @@
     "proxy",
     "vertex-ai"
   ],
-  "author": "",
+  "author": "Badri Narayanan",
   "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/badri-s2001/antigravity_claude_server.git"
+  },
+  "homepage": "https://github.com/badri-s2001/antigravity_claude_server#readme",
+  "bugs": {
+    "url": "https://github.com/badri-s2001/antigravity_claude_server/issues"
+  },
+  "engines": {
+    "node": ">=18.0.0"
+  },
   "dependencies": {
     "cors": "^2.8.5",
     "express": "^4.18.2"