add Telegram alerts: qualified setups, S/R proximity, score drops, daily digest

Closes the action loop — instead of polling the dashboard, the platform pushes
actionable signals to Telegram. New hourly 'alerts' job dispatches four
toggleable triggers, deduped via a new alert_log table (cooldown-based for
qualified/S-R/digest, watermark-based for score deterioration). Admin → Settings
gains a Telegram panel (write-only bot token, chat ID, per-trigger toggles, Send
Test). Credentials follow DB > env precedence (TELEGRAM_BOT_TOKEN / _CHAT_ID).

Backend: alert_service + AlertLog model + migration 005, scheduler job, admin
endpoints/schema. Frontend: AlertSettings panel, hooks, api, types.

Deploy: run alembic upgrade (new alert_log table).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/hooks/useAdmin.ts

@@ -175,6 +175,45 @@ export function useTestSentimentProvider() {
   });
 }
 
+export function useAlertSettings() {
+  return useQuery({
+    queryKey: ['admin', 'alert-settings'],
+    queryFn: () => adminApi.getAlertSettings(),
+  });
+}
+
+export function useUpdateAlertSettings() {
+  const qc = useQueryClient();
+  const { addToast } = useToast();
+
+  return useMutation({
+    mutationFn: (payload: Parameters<typeof adminApi.updateAlertSettings>[0]) =>
+      adminApi.updateAlertSettings(payload),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: ['admin', 'alert-settings'] });
+      addToast('success', 'Alert settings updated');
+    },
+    onError: (error: Error) => {
+      addToast('error', error.message || 'Failed to update alert settings');
+    },
+  });
+}
+
+export function useTestAlert() {
+  const { addToast } = useToast();
+
+  return useMutation({
+    mutationFn: () => adminApi.testAlertSettings(),
+    onSuccess: (result) => {
+      if (result.ok) addToast('success', 'Test alert sent — check Telegram.');
+      else addToast('error', result.error || 'Test alert failed');
+    },
+    onError: (error: Error) => {
+      addToast('error', error.message || 'Test alert failed');
+    },
+  });
+}
+
 export function useTickerUniverseSetting() {
   return useQuery({
     queryKey: ['admin', 'ticker-universe'],