feat: complete web UI + auth providers + template compatibility
All 7 web pages rendering (200):
/login, /dashboard, /catalog, /corporate-memory,
/corporate-memory/admin, /activity-center, /admin/tables
All 13 API endpoints working (200):
health, sync, data, query, users, memory, scripts,
settings, telegram, admin, catalog
Auth providers: Google OAuth, Password (argon2), Email magic link
Cookie-based JWT auth for web UI after OAuth redirect
FlexDict for Flask→FastAPI template compatibility
150 tests passing
0b91d4ac47