fix: correct bin format in package.json (#26)

## Summary

Fixes npm publish warnings by using proper object format for `bin` field.

## Problem

npm was auto-correcting the bin format during publish:

```
npm warn publish "bin" was converted to an object
npm warn publish "bin[efficient-gitlab-mcp-server]" script name was cleaned
```

## Solution

Changed from shorthand:
```json
"bin": "./dist/index.js"
```

To explicit object format:
```json
"bin": {
  "efficient-gitlab-mcp-server": "./dist/index.js"
}
```

Author: ichoosetoaccept

package.json

@@ -6,7 +6,9 @@
   "author": "Ismar <ismart@gmail.com>",
   "type": "module",
   "main": "dist/index.js",
-  "bin": "./dist/index.js",
+  "bin": {
+    "efficient-gitlab-mcp-server": "./dist/index.js"
+  },
   "files": [
     "dist"
   ],