feat: add private Discord progress and explicit shared delivery controls

src/habits/service.ts

@@ -6,7 +6,7 @@ import { addDays, endOfDay, localDate, scheduled, schedulesOverlap, shade } from
 import { calendarSettingsSchema, habitInput, type HabitConfig, type CalendarSettings } from './contracts';
 
 export class ApiError extends Error {
-  constructor(public status: 400 | 404 | 409 | 422 | 429 | 502, message: string) { super(message); }
+  constructor(public status: 400 | 403 | 404 | 409 | 422 | 429 | 502 | 503, message: string) { super(message); }
 }
 const missing = () => new ApiError(404, 'Not found');
 export type Habit = typeof habits.$inferSelect;