feat(web): automations contracts, API client, atoms and hooks

Foundation for the v1 automations UI. Mirrors backend Pydantic schemas
into Zod and wires the data layer end-to-end so feature surfaces can
be built on top.

contracts/types/automation.types.ts:
- AutomationStatus, TriggerType, RunStatus enums.
- AutomationDefinition envelope (PlanStep, TriggerSpec, Execution,
  Metadata, Inputs).
- AutomationCreate/Update/Detail/Summary/List + listParams.
- TriggerCreate/Update/Detail.
- RunSummary/Detail/List + runListParams.

lib/apis/automations-api.service.ts:
- list/get/create/update/delete automations.
- add/update/remove triggers (sub-resource).
- list/get runs (read-only sub-resource).
- safeParse on every write, 204-safe deletes.

atoms/automations/:
- automationsListAtom (active search space, first page).
- 6 mutation atoms with toast + cache invalidation.

hooks/:
- use-automations.ts wraps the list atom.
- use-automation.ts: parameterized detail by id.
- use-automation-runs.ts: useAutomationRuns + useAutomationRun.

lib/query-client/cache-keys.ts: automations namespace (list, detail,
runs, run) keyed by (id, limit, offset) where relevant.

Smoke: zod round-trip OK on backend-shape payloads (Automation,
AutomationCreate, Trigger, Run); typecheck clean for new files;
biome clean.

surfsense_web/atoms/automations/automations-query.atoms.ts

@@ -0,0 +1,31 @@
+import { atomWithQuery } from "jotai-tanstack-query";
+import { activeSearchSpaceIdAtom } from "@/atoms/search-spaces/search-space-query.atoms";
+import { automationsApiService } from "@/lib/apis/automations-api.service";
+import { cacheKeys } from "@/lib/query-client/cache-keys";
+
+// First page of the active search space's automations.
+// Detail + paginated/parameterized reads live in hooks (see use-automation.ts,
+// use-automation-runs.ts) so atoms stay tied to "current scope" and don't
+// proliferate atom families for every (id, limit, offset) tuple.
+const DEFAULT_LIMIT = 50;
+const DEFAULT_OFFSET = 0;
+
+export const automationsListAtom = atomWithQuery((get) => {
+	const searchSpaceId = get(activeSearchSpaceIdAtom);
+
+	return {
+		queryKey: cacheKeys.automations.list(Number(searchSpaceId ?? 0), DEFAULT_LIMIT, DEFAULT_OFFSET),
+		enabled: !!searchSpaceId,
+		staleTime: 60 * 1000,
+		queryFn: async () => {
+			if (!searchSpaceId) {
+				return { items: [], total: 0 };
+			}
+			return automationsApiService.listAutomations({
+				search_space_id: Number(searchSpaceId),
+				limit: DEFAULT_LIMIT,
+				offset: DEFAULT_OFFSET,
+			});
+		},
+	};
+});