Add macOS development station playbook and role

- Created a new Ansible playbook for configuring macOS development stations.
- Added role `macos_dev_station` with default variables, handlers, and tasks.
- Implemented tasks for installing Homebrew packages, managing user configurations, and setting up launch agents for code-server and opencode.
- Included templates for launchd plist files and startup scripts for code-server and opencode.
- Added validation for required environment variables and configurations.
- Updated inventory to include macOS hosts and added a setup script for initial prerequisites.
- Modified Terraform configuration to include DNS records for new services.

scripts/setup-dev-station.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+SCRIPT_NAME="$(basename "$0")"
+LOG_FILE="${HOME}/.setup-dev-station.log"
+
+log() {
+  printf '[%s] %s\n' "${SCRIPT_NAME}" "$*" | tee -a "${LOG_FILE}"
+}
+
+if [[ "$(uname -s)" != "Darwin" ]]; then
+  log "This script is for macOS only."
+  exit 1
+fi
+
+log "Starting macOS bootstrap for dev station prerequisites."
+
+if ! xcode-select -p >/dev/null 2>&1; then
+  log "Installing Xcode Command Line Tools (follow GUI prompt once)."
+  xcode-select --install || true
+else
+  log "Xcode Command Line Tools already installed."
+fi
+
+if ! command -v brew >/dev/null 2>&1; then
+  log "Installing Homebrew."
+  /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+else
+  log "Homebrew already installed."
+fi
+
+if [[ -x /opt/homebrew/bin/brew ]]; then
+  eval "$(/opt/homebrew/bin/brew shellenv)"
+fi
+
+if ! grep -Fq '/opt/homebrew/bin/brew shellenv' "${HOME}/.zprofile" 2>/dev/null; then
+  log "Persisting Homebrew shellenv into ~/.zprofile."
+  printf '\n# Homebrew\neval "$(/opt/homebrew/bin/brew shellenv)"\n' >> "${HOME}/.zprofile"
+else
+  log "Homebrew shellenv already present in ~/.zprofile."
+fi
+
+log "Updating Homebrew metadata."
+brew update
+
+log "Installing bootstrap packages."
+brew install git curl jq python ansible
+
+log "Preparing workspace directories."
+mkdir -p "${HOME}/projects" "${HOME}/scripts"
+
+log "Bootstrap complete."
+log "Next step: run Ansible playbook for full dev-station configuration:"
+log "  cd ~/projects/a13labs.infra/ansible"
+log "  ansible-playbook playbook_macos_dev_station.yml --limit darwin_dev"