fix(cron): switch manual trigger to POST to match backend CSRF fix

Backend GHSA-8qhj-4f8c-j8qg moves /api/v1/cron/:id/manual from GET to
POST so SameSite=Lax cookies no longer expose this state-changing
endpoint to cross-site CSRF. Update runCron() accordingly.

Co-authored-by: cloudcode <cloudcode@users.noreply.github.com>

src/api/cron.ts

@@ -15,5 +15,5 @@ export const deleteCron = async (id: number[]): Promise<void> => {
 }
 
 export const runCron = async (id: number): Promise<void> => {
-    return fetcher<void>(FetcherMethod.GET, `/api/v1/cron/${id}/manual`, null)
+    return fetcher<void>(FetcherMethod.POST, `/api/v1/cron/${id}/manual`, null)
 }