0.32.1 — CLI Modularization & Updater Speed

Fixed: Auto-Updater Check Throttle — reduced update check throttle from 24h to 10 minutes (UPDATE_CHECK_INTERVAL_MS = 10m) and prioritized global npm install -g kandown --force for npm setups so release updates trigger promptly when launching Kandown.
Added: kandown upgrade Command Alias — added upgrade as an alias for kandown update.
Refactored: CLI Modular Architecture — refactored monolithic bin/kandown.js (3,500+ lines) into clean, modular TypeScript files in src/cli/ (cli.ts, lib/updater.ts, lib/board-reader.ts, lib/daemon.ts). Built automatically into bin/kandown.js via tsup.