feat: add files and forum modules — Phase 7+8
Files module (rFiles): file upload/download, share links with
expiry/password/download limits, memory cards CRUD, access logging,
cleanup timers replacing Django Celery tasks.
Forum module (rForum): Discourse cloud provisioner with Hetzner VPS
creation, Cloudflare DNS, cloud-init for automated Discourse install,
async provisioning pipeline with step logging, instance management.
All 10 modules now active: Canvas, rBooks, rPubs, rCart, Providers,
Swag, rChoices, rFunds, rFiles, rForum.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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