feat(Qui): add Qui — modern qBittorrent web manager with cross-seeding

[yesrab]

Add Qui — modern qBittorrent web manager with cross-seeding

Summary

This PR adds a new app, Qui (autobrr/qui), under Apps/Qui/.

Qui is a fast, modern web interface for qBittorrent. It connects and manages multiple
qBittorrent instances from a single dashboard, and adds rule-based automation, built-in
cross-seeding across Torznab-compatible indexers (e.g. Prowlarr / Jackett), and
scheduled backups. It ships as a lightweight single binary.

App ID	org.icewhale.qui
Category	Media
Image	ghcr.io/autobrr/qui:v1.21.0 (pinned)
Default port	7476 (HTTP)
Database	PostgreSQL (postgres:16-alpine), deployed automatically

What changed

New app directory Apps/Qui/:

• docker-compose.yml — Qui + PostgreSQL on a dedicated bridge network
• icon.svg, icon.png
• screenshot-1.png, screenshot-2.png, screenshot-3.png
• thumbnail.png

Compose / metadata notes:

• name: qui (lowercase, unique app id)
• Required x-casaos.app_id: org.icewhale.qui (reverse-domain notation)
• Top-level x-casaos follows the CONTRIBUTING field-grouping order
  (access entry → display → metadata → version → links)
• author: CasaOS Team (store-side) / developer: autobrr (upstream)
• i18n: en_US + zh_CN for description, tagline, tips, release_notes
• Pinned image tags (no latest); PostgreSQL credentials/DSN supplied via env

Compliance with CONTRIBUTING

• Valid YAML
• No latest image tags
• Top-level name is the unique app id
• container_name matches the service name (qui)
• x-casaos field grouping order followed
• i18n blocks include at least en_US
• App dir includes compose, an icon, and at least one screenshot

Testing

• Installed on a local ZimaOS instance: the app starts, the Web UI is reachable on
  port 7476, and the PostgreSQL backend connects.
• scripts/build_appstore.py parses the app without errors: app_id validates as
  reverse-domain, version: 1.21.0 is valid semver, and the category normalizes to media.

First-run notes

1. Open the Web UI at http://<zima-ip>:7476.
2. Create the administrator account on the setup screen.
3. Add one or more qBittorrent instances to start managing them.
4. Point Qui at your Torznab indexers (Prowlarr / Jackett) to enable cross-seeding.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[yesrab]

validator failing in etherpad?