Can I vibecode PostFast?

Build me a personal social scheduler my coding agent can drive, to replace PostFast. Requirements:

- Node + Express + better-sqlite3 on my always-on box. Two interfaces over one core:
  a localhost page (compose box, media attach, queue by send time) and a stdio MCP
  server via @modelcontextprotocol/sdk with create_post, list_posts, and delete_post,
  so Claude Code can schedule without me opening the page.
- Open-API networks only: Bluesky (app password via @atproto/api), Mastodon (access
  token), Telegram channel (bot token). One adapter file per network, creds in .env.
- For the gated platforms (Instagram, TikTok, YouTube, Facebook, Threads, LinkedIn,
  Pinterest, Google Business Profile) do not fight the APIs: at send time push me an
  ntfy.sh alert with the caption and media path and I post by hand. The README says
  plainly that these need reviewed developer apps, not more code.
- Slot-based queue: posting times per weekday in my timezone, new posts take the next
  free slot or pin to an exact datetime; one post fans out to several networks with
  per-network text.
- A node-cron tick every minute sends what is due, marks the row sending before it
  calls anything so a crash never double-posts, retries 3 times with backoff, then
  records sent or failed with the error.
- Media in media/ beside the database, images resized per network with sharp. Video:
  accept MP4 only and check duration, aspect ratio, and size against each network's
  limits at attach time, rejecting with the limit in the message rather than fixing it.
- A history page of the last 100 sends linking to the live posts.
- Binds to localhost only. No accounts, no telemetry, everything stays on my box.
- Out of scope: video transcoding, analytics, approval workflows, and workspaces.
  Do not build auth.
- README: Bluesky app password, Mastodon token, Telegram bot token, wiring the MCP
  server into Claude Code, and a warning that social APIs drift and need patching.