Prepare the repository for a public release

- docs/deployment.md: step-by-step Docker deployment for anyone (setup,
  configuration, LAN/HTTPS/VPN access, adding manga, operation, prebuilt
  images, backups, peering, troubleshooting, rules for agents).
- deploy/circus.sh: host helper without Node (status, up/down with queue
  pause, logs, pause/resume, update, rescan, restore-test); deploy/compose.https.yml
  + Caddyfile for automatic HTTPS.
- README rewritten for public readers (Docker first, sources/copyright note,
  docs index); AGENTS.md + CLAUDE.md for contributors and coding agents.
- Removed notes about one particular installation (Windows host, handoffs,
  audits of a private library, benchmarks with local paths, wishlist, reading
  map) and the unused ops/proxmox templates; generalized remaining mentions of
  hosts, VPN and Windows-only commands.
- Defaults: TZ and reading time zone UTC; .gitattributes keeps shell/YAML LF.
- Personal agent coordination files are git-ignored (CLAUDE.local.md,
  .claude/skills/manga-org/).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/backup.md

@@ -112,5 +112,5 @@ and queue changes made after that backup are lost.
 
 The scraper token is not in `DATA`; Compose keeps it under `.secrets/` (or the
 deployment's `SCRAPER_TOKEN_PATH`). Restore tests should unpack into a separate
-folder and run an isolated stack (no second writer against the live library), as
-a restore-test script does for the host-level archives.
+folder and run an isolated reader (no second writer against the live library), as
+`deploy/circus.sh restore-test` does.