Vale construir sua versão de Postiz?

Build me a personal social post scheduler to replace Postiz. Requirements:

- Node + Express + better-sqlite3; a localhost page with a compose box,
  image attach, and the queue ordered by send time.
- Three targets: Mastodon (access token), Bluesky (app password via
  @atproto/api), and a Telegram channel (bot token). Creds in .env, one
  small adapter file per network so a fourth is addable later.
- Slot-based queueing: I define posting times per weekday in my timezone
  and new posts fill the next free slot; a post can also be pinned to an
  exact datetime or duplicated across networks with per-network text.
- A node-cron tick every minute publishes due posts, marks each row sent
  or failed, retries failures 3 times with backoff, and marks before
  sending so nothing ever double-posts.
- Per-network character counter in the composer; attached images stored
  in media/ next to the database, resized to each network's limits with
  sharp.
- A history page of the last 100 sent posts linking to the live posts.
- Runs on my always-on box; localhost only, no accounts, no telemetry.
- Out of scope: Instagram, LinkedIn, TikTok, and X (approval-gated or
  paid APIs, say so in the README), analytics, teams, and AI features.
- README: getting a Mastodon token, a Bluesky app password, and a
  Telegram bot token.