Flatten directory structure and update documentation

- Moved all files from mac_os/ subdirectory to repository root
- Updated README.adoc to reflect simplified architecture
- Updated QUICK_INSTALL.md with all current apps
- Added claude-cli to install.sh and bin/install_homebrew_formulas
- Repository now shows clean file structure without nested mac_os folder
- Documentation now accurately describes opinionated installer approach

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

lib/settings.sh

@@ -0,0 +1,12 @@
+#! /usr/bin/env bash
+
+set -o nounset
+set -o errexit
+set -o pipefail
+IFS=$'\n\t'
+
+# Get the absolute path to the mac_os directory
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+export MAC_OS_PATH="$(dirname "$SCRIPT_DIR")"
+
+export MAC_OS_WORK_PATH=/tmp/downloads