chore(goreleaser): update brew tap configuration key

The brew tap configuration key has been changed from 'folder' to 'directory'
to align with GoReleaser's expected configuration syntax. This ensures
correct deployment of Homebrew formulas to the designated repository path.

Author: zzxwill

.goreleaser.yml

@@ -69,7 +69,7 @@ brews:
     repository:
       owner: agentsdance
       name: agentx
-    folder: Formula
+    directory: Formula
     homepage: "https://github.com/agentsdance/agentx"
     description: "CLI tool for managing MCP servers and skills across AI coding agents"
     license: "Apache-2.0"