feat: realtime WebSocket layer for live events and streaming logs

- Backend: ConnectionManager, Redis-backed bus with in-process fallback,
  channel authorization, and typed emit helpers wired into workers
  (ai_runtime, sandbox_gateway), workforce/sandbox/billing/audit/error services.
- Frontend: single shared WS client with backoff + heartbeat, RealtimeProvider,
  useLiveChannel/useLiveEvent hooks, live indicators on task detail, manager
  chat, dashboard, traces, sandbox terminal, admin errors, and billing.
- Contracts: WsEvent/WsServerFrame/WsClientFrame types mirroring the port.

All 255 backend tests pass; web typecheck and build pass.

apps/api/app/infrastructure/error_log.py

@@ -255,6 +255,19 @@ async def record_error(
         request_id or "-",
         fingerprint,
     )
+
+    # Live push to the platform-owner console. Best-effort like everything here:
+    # a failed publish must not turn a recorded error into an unrecorded one.
+    from app.application.ports.realtime import emit_error_recorded
+
+    await emit_error_recorded(
+        error_id=event.id,
+        kind=event.kind,
+        message=event.message,
+        severity=str(severity),
+        source=str(source),
+        organization_id=event.organization_id,
+    )
     return event.id