feat(integrations): add UnifiOsIntegration with optional cloud enrichment

Introduces UnifiOsIntegration, orchestrating UnifiOsApi (local) and
UnifiSmApi (optional cloud) to build the UnifiOsSummary. Local endpoint
calls degrade independently via Promise.allSettled; the cloud client is
never instantiated without a configured siteManagerApiKey secret.
Registers the unifiOs kind in the integration creator, index, and types
barrels, resolving the previously-failing typecheck.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/integrations/src/index.ts

@@ -99,5 +99,7 @@ export { anchorNotesListInputSchema } from "./anchor/anchor-types";
 export { anchorNoteUpdateInputSchema } from "./anchor/anchor-types";
 export { downloadClientItemSchema } from "./interfaces/downloads/download-client-items";
 
+export { UnifiOsIntegration } from "./unifi-os/unifi-os-integration";
+
 // Helpers
 export { createIntegrationAsync } from "./base/creator";