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Implement the Web Application Open Platform Interface (WOPI) protocol to enable collaborative document editing with Collabora Online and OnlyOffice through OxiCloud. Backend: - WOPI token service with HMAC-SHA256 signed access tokens - WOPI lock service with in-memory lock management and expiry - WOPI discovery service for auto-detecting editor capabilities - WOPI HTTP handler: CheckFileInfo, GetFile, PutFile, Lock/Unlock - File entity extended with owner_id for WOPI file-info responses - Configuration via WOPI_* environment variables - Services wired through DI in AppState Frontend: - WOPI editor component with modal and new-tab viewing modes - Context menu integration for opening files in online editors - Inline viewer integration for document preview Infrastructure: - Docker Compose file for local Collabora/OnlyOffice dev setup Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>