fix: use SameSite=None; Secure on HF Spaces to allow cross-site iframe cookies

feat: channel RBAC through ingest, graph stream, admin endpoints, email invite

feat: implement Google OAuth2 SSO integration with user management and callback handling

feat: RBAC foundation — workspaces, channels, role-based access

Fix pydantic extra fields error in IntegrationSettings and Settings

feat: add Zustand stores for filters and UI state management

feat: Implement polling adapters for logs, metrics, error traces, and business data