Add dynamic loading of standard alert references

Replaced hardcoded standard alert metadata with API-driven data. This change ensures the standard alert information is dynamically loaded from the backend, improving maintainability and scalability. Also adjusted the frontend to handle cases where no data is available.

backend/app/api/routes/alerts.py

@@ -12,8 +12,10 @@ from app.schemas.alert import (
     AlertDefinitionTestResponse,
     AlertDefinitionUpdate,
     AlertStatusResponse,
+    StandardAlertReferenceItem,
 )
 from app.services.alerts import (
+    get_standard_alert_reference,
     get_alert_status,
     invalidate_alert_cache,
     run_scalar_sql_for_target,
@@ -44,6 +46,14 @@ async def list_alert_status(
     return payload
 
 
+@router.get("/standard-reference", response_model=list[StandardAlertReferenceItem])
+async def list_standard_alert_reference(
+    user: User = Depends(get_current_user),
+) -> list[StandardAlertReferenceItem]:
+    _ = user
+    return [StandardAlertReferenceItem(**item) for item in get_standard_alert_reference()]
+
+
 @router.get("/definitions", response_model=list[AlertDefinitionOut])
 async def list_alert_definitions(
     user: User = Depends(get_current_user), db: AsyncSession = Depends(get_db)