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>

app/routers/admin.py

@@ -10,6 +10,7 @@ from app.dependencies import get_db, require_admin
 from app.models.user import User
 from app.schemas.admin import (
     ActivationConfigUpdate,
+    AlertConfigUpdate,
     CreateUserRequest,
     DataCleanupRequest,
     JobToggle,
@@ -24,6 +25,7 @@ from app.schemas.admin import (
 )
 from app.schemas.common import APIEnvelope
 from app.services import admin_service
+from app.services import alert_service
 from app.services import sentiment_provider_service
 from app.services import ticker_universe_service
 
@@ -210,6 +212,37 @@ async def test_sentiment_settings(
     return APIEnvelope(status="success", data=result)
 
 
+@router.get("/admin/settings/alerts", response_model=APIEnvelope)
+async def get_alert_settings(
+    _admin: User = Depends(require_admin),
+    db: AsyncSession = Depends(get_db),
+):
+    config = await alert_service.get_alert_config(db)
+    return APIEnvelope(status="success", data=config)
+
+
+@router.put("/admin/settings/alerts", response_model=APIEnvelope)
+async def update_alert_settings(
+    body: AlertConfigUpdate,
+    _admin: User = Depends(require_admin),
+    db: AsyncSession = Depends(get_db),
+):
+    config = await alert_service.update_alert_config(
+        db, **body.model_dump(exclude_unset=True)
+    )
+    return APIEnvelope(status="success", data=config)
+
+
+@router.post("/admin/settings/alerts/test", response_model=APIEnvelope)
+async def test_alert_settings(
+    _admin: User = Depends(require_admin),
+    db: AsyncSession = Depends(get_db),
+):
+    """Send a test Telegram message with the current config."""
+    result = await alert_service.send_test_alert(db)
+    return APIEnvelope(status="success", data=result)
+
+
 @router.get("/admin/settings/ticker-universe", response_model=APIEnvelope)
 async def get_ticker_universe_setting(
     _admin: User = Depends(require_admin),