feat(automations): implement model eligibility checks for automation creation

- Added model eligibility checks to ensure automations can only use billable models (premium or BYOK).
- Introduced new API endpoint to report model eligibility status for search spaces.
- Updated frontend components to display eligibility alerts and disable creation options when models are not billable.
- Enhanced automation creation forms to reflect model eligibility, preventing users from submitting invalid configurations.
- Implemented server-side logic to capture and preserve model preferences across automation edits, ensuring consistent behavior during execution.

surfsense_web/hooks/use-automation-model-eligibility.ts

@@ -0,0 +1,25 @@
+"use client";
+import { useQuery } from "@tanstack/react-query";
+import type { ModelEligibility } from "@/contracts/types/automation.types";
+import { automationsApiService } from "@/lib/apis/automations-api.service";
+import { cacheKeys } from "@/lib/query-client/cache-keys";
+
+/**
+ * Whether the search space's configured models are billable for automations.
+ *
+ * Automations may only run on premium global models or user-provided (BYOK)
+ * models; free global models and Auto mode are blocked so every run is metered
+ * in premium credits. Creation surfaces use this to gate their CTAs before the
+ * user invests effort drafting an automation that can't be saved.
+ *
+ * Keyed by search space id (not the jotai "current scope" atom) so it can be
+ * used on the create route as well as the list page.
+ */
+export function useAutomationModelEligibility(searchSpaceId: number | undefined) {
+	return useQuery<ModelEligibility, Error>({
+		queryKey: cacheKeys.automations.modelEligibility(searchSpaceId ?? 0),
+		queryFn: () => automationsApiService.getModelEligibility(searchSpaceId as number),
+		enabled: !!searchSpaceId,
+		staleTime: 60_000,
+	});
+}