feat(integration): initial Zoom Events backend integration

- Implemented Server-to-Server OAuth2 logic in e_zoom_methods.py.
- Created V3 Action router for Zoom (test_connection, fetch tickets, atomic sync).
- Added sync_zoom_attendees_to_event with mapping to Aether person/badge models.
- Registered /v3/action/e_zoom router.
- Added E2E connection test script.

app/routers/registry.py

@@ -7,7 +7,7 @@ from app.routers import (
     event_device, event_exhibit, event_exhibit_tracking, event_file, event_importing,
     event_location, event_person,
     event_presentation, event_presenter, event_session,
-    flask_cfg, hosted_file, api_v3_actions_hosted_file, api_v3_actions_event_file, lookup,
+    flask_cfg, hosted_file, api_v3_actions_hosted_file, api_v3_actions_event_file, api_v3_actions_e_zoom, lookup,
     organization, page, person,
     person_user, qr, site, site_domain, user,
     util_email, websockets, websockets_redis, websockets_v3, e_confex, e_cvent, e_impexium, e_stripe
@@ -49,6 +49,7 @@ def setup_routers(app: FastAPI):
     app.include_router(hosted_file.router, prefix='/hosted_file', tags=['Hosted File'])
     app.include_router(api_v3_actions_hosted_file.router, prefix='/v3/action/hosted_file', tags=['Hosted File (V3 Actions)'])
     app.include_router(api_v3_actions_event_file.router, prefix='/v3/action/event_file', tags=['Event File (V3 Actions)'])
+    app.include_router(api_v3_actions_e_zoom.router, prefix='/v3/action/e_zoom', tags=['Zoom Events (V3 Actions)'])
     app.include_router(lookup.router, prefix='/lu', tags=['Lookup'])
 
     # app.include_router(organization.router, prefix='/organization', tags=['Organization'], dependencies=[Depends(DeprecationParams)])