feat(scheduling): persist notifications, batch notify flow, dedup protection

- Add tab_scheduling_notifications table with bootstrap via ensureSchedulingTables()
- Notify endpoint rewritten: dedup by (suggestion_id, candidate_plate), history list, PATCH /:id for execute/cancel lifecycle
- Batch notify endpoint returns success/skipped/failed counts
- Suggestions response now carries notificationId + notificationStatus per candidate (joined from active-notification map)
- UI: select mode with checkboxes, floating action bar, confirmation modal listing each swap; already-notified items are dimmed and skipped
- Detail view badges show sent/executed state, preventing duplicate notify

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/modules/scheduling/api.ts

@@ -1,5 +1,13 @@
 import { fetchJson } from '../../auth/api-client';
-import type { SchedulingResponse } from './types';
+import type {
+  SchedulingResponse,
+  NotifyRequest,
+  NotifyBatchRequest,
+  NotifyBatchResult,
+  NotificationRecord,
+  NotificationStatus,
+  UpdateNotificationRequest,
+} from './types';
 
 const BASE = '/api/scheduling';
 
@@ -10,14 +18,44 @@ export async function fetchSuggestions(targetId?: number): Promise<SchedulingRes
   return fetchJson<SchedulingResponse>(`${BASE}/suggestions${qs ? `?${qs}` : ''}`);
 }
 
-export async function sendNotify(body: {
-  suggestionId: string;
-  currentPlate: string;
-  candidatePlate: string;
-}): Promise<{ success: boolean; message: string }> {
-  return fetchJson<{ success: boolean; message: string }>(`${BASE}/notify`, {
+export async function sendNotify(
+  body: NotifyRequest,
+): Promise<{ success: boolean; message: string; record?: NotificationRecord }> {
+  return fetchJson(`${BASE}/notify`, {
     method: 'POST',
     headers: { 'Content-Type': 'application/json' },
     body: JSON.stringify(body),
   });
 }
+
+export async function sendNotifyBatch(
+  body: NotifyBatchRequest,
+): Promise<{ success: boolean; message: string; result: NotifyBatchResult }> {
+  return fetchJson(`${BASE}/notify/batch`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(body),
+  });
+}
+
+export async function fetchNotifications(
+  status?: NotificationStatus,
+  limit?: number,
+): Promise<{ records: NotificationRecord[] }> {
+  const params = new URLSearchParams();
+  if (status) params.set('status', status);
+  if (limit) params.set('limit', String(limit));
+  const qs = params.toString();
+  return fetchJson(`${BASE}/notify${qs ? `?${qs}` : ''}`);
+}
+
+export async function updateNotification(
+  id: number,
+  body: UpdateNotificationRequest,
+): Promise<{ success: boolean; record?: NotificationRecord; message?: string }> {
+  return fetchJson(`${BASE}/notify/${id}`, {
+    method: 'PATCH',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(body),
+  });
+}