fix(schedule): 스케줄 toggle API 메서드 불일치 수정 (#6)

Backend @PatchMapping에 맞춰 Frontend toggleSchedule을 POST → PATCH로 변경
patchJson 헬퍼 함수 추가

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/api/batchApi.ts

@@ -26,6 +26,16 @@ async function putJson<T>(url: string, body?: unknown): Promise<T> {
   return res.json();
 }
 
+async function patchJson<T>(url: string, body?: unknown): Promise<T> {
+  const res = await fetch(url, {
+    method: 'PATCH',
+    headers: { 'Content-Type': 'application/json' },
+    body: body ? JSON.stringify(body) : undefined,
+  });
+  if (!res.ok) throw new Error(`API Error: ${res.status} ${res.statusText}`);
+  return res.json();
+}
+
 async function deleteJson<T>(url: string): Promise<T> {
   const res = await fetch(url, { method: 'DELETE' });
   if (!res.ok) throw new Error(`API Error: ${res.status} ${res.statusText}`);
@@ -400,7 +410,7 @@ export const batchApi = {
     deleteJson<{ success: boolean; message: string }>(`${BASE}/schedules/${jobName}`),
 
   toggleSchedule: (jobName: string, active: boolean) =>
-    postJson<{ success: boolean; message: string; data?: ScheduleResponse }>(
+    patchJson<{ success: boolean; message: string; data?: ScheduleResponse }>(
       `${BASE}/schedules/${jobName}/toggle`, { active }),
 
   // Timeline