refactor: remove KI-Orakel from history page and backend

Drop oracle UI, API endpoint, scheduled generation, and related docs.

Co-authored-by: Cursor <cursoragent@cursor.com>

public/lib/api.js

@@ -26,7 +26,6 @@ export const api = {
   history: (days = 90) => request(`/api/history?days=${days}`),
   stats: () => request("/api/stats"),
   roast: () => request("/api/roast"),
-  oracle: () => request("/api/oracle"),
   snooze: (slot_id, minutes) => request("/api/snooze", { method: "POST", body: JSON.stringify({ slot_id, minutes }) }),
   vapidKey: () => request("/api/vapid-public-key"),
   pushSubscribe: (subscription) =>