fix: restore bin field as object for proper CLI naming

The bin field needs to be an object to properly name the CLI command as 'mcp-wayback-machine'.
When bin is a string, npm uses the package name directly, which is correct in this case,
but using an object is more explicit and matches our tests.

Author: Mearman

package.json

@@ -4,7 +4,9 @@
 	"description": "MCP server for interacting with the Wayback Machine without API keys",
 	"main": "dist/index.js",
 	"type": "module",
-	"bin": "dist/index.js",
+	"bin": {
+		"mcp-wayback-machine": "dist/index.js"
+	},
 	"scripts": {
 		"build": "tsc",
 		"dev": "tsx watch src/index.ts",