feat: agent updates from SAC, poll config, SSH/WinRM fallback (0.12.0)

Add agent update settings, pending self-update via poll, desired config per host, and automatic or manual SSH/WinRM fallback when agents do not report agent.update events.

backend/app/services/ingest.py

@@ -5,6 +5,7 @@ from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm import Session
 
 from app.models import Event, Host
+from app.services.agent_update import process_agent_update_ingest
 from app.services.daily_report_format import normalize_daily_report_details
 from app.services.event_severity_overrides import apply_severity_override
 from app.services.host_inventory import INVENTORY_EVENT_TYPE, process_inventory_ingest
@@ -123,4 +124,6 @@ def ingest_event(db: Session, payload: dict) -> tuple[Event, bool]:
         if raced is not None:
             return raced, False
         raise
+
+    process_agent_update_ingest(db, host, payload.get("type", ""), details)
     return event, True