Vale construir sua versão de Zernio?

Build me a personal social publishing API to replace Zernio. Requirements:

- Node + Fastify + better-sqlite3, single API key from .env, runs on my
  always-on box.
- Adapters ONLY for networks that hand out credentials on signup: Bluesky
  (app password via @atproto/api), Mastodon (access token), Telegram channel
  (bot token), Discord (webhook URL), Reddit (script app). One small adapter
  file per network so a sixth is addable later; scaffold nothing I don't use.
- POST /posts accepts text, image URLs, scheduledFor (ISO, my timezone), and
  a list of target accounts; media is downloaded once to media/ and checked
  for type and size before the post is accepted.
- A node-cron tick every minute publishes due posts: mark a row as sending
  before publishing so nothing ever double-posts, per-target status, 3
  retries with backoff, partial failures don't block other targets.
- GET /posts and GET /posts/:id return queue state and per-network
  permalinks; a plain localhost page lists the queue and recent failures.
- Optional webhook: POST to a URL from .env on published and failed.
- Binds to localhost only. No accounts, no telemetry.
- Out of scope: the approval-gated networks (Instagram, TikTok, LinkedIn,
  Threads, YouTube, Pinterest), DMs, comments, analytics, and ads. Skip
  anything that needs a phone number (WhatsApp, SMS, calls): numbers,
  carrier access, and KYC cannot be vibecoded.
- README: how to get each credential (Bluesky app password, Mastodon token,
  Telegram bot via BotFather, Reddit script app), plus an honest note that
  the closed networks need app review or paid API tiers.