setup

Use when the user says "set up findash", "onboard", "first-time setup", "get findash running", "configure findash", or is installing the plugin for the first time. Runs findash-doctor's safe auto-fixes, then guides the human through the steps only they can do — creating `.secrets/findash`, the rclone Google Drive OAuth, the Telegram bot, and the one-time bank-scraper browser seeding.