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/hooks/use-automation.ts

@@ -0,0 +1,19 @@
+"use client";
+import { useQuery } from "@tanstack/react-query";
+import type { Automation } from "@/contracts/types/automation.types";
+import { automationsApiService } from "@/lib/apis/automations-api.service";
+import { cacheKeys } from "@/lib/query-client/cache-keys";
+
+/**
+ * Fetch a single automation with its definition and triggers.
+ * Lives outside the jotai atom layer because it's keyed by id, not by the
+ * "current scope" the atom layer assumes.
+ */
+export function useAutomation(automationId: number | undefined) {
+	return useQuery<Automation, Error>({
+		queryKey: cacheKeys.automations.detail(automationId ?? 0),
+		queryFn: () => automationsApiService.getAutomation(automationId as number),
+		enabled: !!automationId,
+		staleTime: 60_000,
+	});
+}