Can I vibecode PostFast?

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

- Node.js 22 + TypeScript: a Fastify API, a React UI built with Vite and a worker loop in the same
  process. `npm start` serves http://localhost:4870.
- Storage: better-sqlite3 in ./data/posts.db: accounts (network, name, access token encrypted with
  libsodium `crypto_secretbox`, key in .env), posts (text, media paths, scheduled_at in UTC, status:
  draft, scheduled, publishing, published or failed) and one result row per account (URL or error).
- Networks: one adapter per file behind a `Publisher` interface with `validate()` and `publish()`.
  Start with Bluesky (`@atproto/api`, app password), Telegram (Bot API), LinkedIn (own developer app,
  `w_member_social`), X (API v2, own keys) and Threads (Meta Graph API, own app in development mode).
- Composer: one text box with per-network character counters and previews, per-account overrides, image
  and video upload checked against each network's limits (`ffprobe` for size and duration), drafts, and
  a month calendar (`@fullcalendar/react`) where dragging a post reschedules it.
- Worker: every 30 seconds publish due posts, one account at a time, with 3 retries and exponential
  backoff. Claim a post in a single SQL transaction so it is never published twice; a failure on one
  account doesn't block the others.
- Limits: `config.json` holds per-network daily caps; refuse to schedule past a cap.
- API: `POST /api/posts` and `GET /api/posts?status=` with a bearer token from .env, for scripts and agents.
- Single user, one password in .env. No telemetry, local-first; outbound calls go only to the networks.
- Out of scope: TikTok, Instagram, YouTube, Pinterest, analytics, a social inbox, approvals, teams, mobile.
- README: where to create the developer app and token for each network and which permissions to ask
  for, a warning that X's API terms change and that Meta apps in development mode only act for accounts
  with a role on the app, and a note that the machine must be on at post time (or run it on a VPS).

Opens your agent with the prompt filled in, you press enter. Or copy it and paste it into an empty folder.