5a1ad2eb97
Add complete SignalR infrastructure for real-time project collaboration and notifications with multi-tenant isolation and JWT authentication. Changes: - Created BaseHub with multi-tenant isolation and JWT authentication helpers - Created ProjectHub for real-time project collaboration (join/leave, typing indicators) - Created NotificationHub for user-level notifications - Implemented IRealtimeNotificationService for application layer integration - Configured SignalR in Program.cs with CORS and JWT query string support - Added SignalRTestController for connection testing - Documented hub endpoints, client events, and integration examples Features: - Multi-tenant isolation via automatic tenant group membership - JWT authentication (Bearer header + query string for WebSocket) - Hub endpoints: /hubs/project, /hubs/notification - Project-level events: IssueCreated, IssueUpdated, IssueStatusChanged, etc. - User-level notifications with tenant-wide broadcasting - Test endpoints for validation 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>