feat(claude-code): brand coder-utils scripts with display_name and icon

Pass display_name_prefix = "Claude Code" and icon = "/icon/claude.svg"
through to the coder-utils module so the workspace shows
"Claude Code: Install Script" with the Claude icon instead of the
generic defaults.

Relies on the two new variables added to coder-utils on PR #842's
branch.

Author: matifali

registry/coder/modules/claude-code/main.tf

@@ -105,6 +105,9 @@ module "coder-utils" {
   agent_name       = "claude-code"
   module_directory = "$HOME/.claude-module"
 
+  display_name_prefix = "Claude Code"
+  icon                = "/icon/claude.svg"
+
   pre_install_script  = var.pre_install_script
   post_install_script = var.post_install_script