feat(metabase): nuevos modulos — snippets, notifications, dashboard_filters

Tres modulos nuevos con funciones CRUD completas:
- snippets: list, get, create, update, archive (SQL reutilizable)
- notifications: list, create_card_alert, create_dashboard_subscription, update, delete
- dashboard_filters: add_dashboard_filter (parameter_mappings sobre cards existentes)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

python/functions/metabase/metabase_delete_notification.md

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+---
+name: metabase_delete_notification
+kind: function
+lang: py
+domain: infra
+version: "1.0.0"
+purity: impure
+signature: "def metabase_delete_notification(client: MetabaseClient, notification_id: int) -> None"
+description: "Elimina una notificacion de Metabase (alerta de card o suscripcion de dashboard). Operacion irreversible. Endpoint: DELETE /api/notification/:id."
+tags: [metabase, notification, delete, api, python]
+uses_functions: []
+uses_types: []
+returns: []
+returns_optional: false
+error_type: "error_go_core"
+imports: []
+params:
+  - name: client
+    desc: "instancia autenticada de MetabaseClient"
+  - name: notification_id
+    desc: "ID de la notificacion a eliminar"
+output: "None"
+tested: false
+tests: []
+test_file_path: ""
+file_path: "python/functions/metabase/notifications.py"
+---
+
+## Ejemplo
+
+```python
+# Eliminar una alerta por su ID
+metabase_delete_notification(client, 99)
+
+# Patron: listar y eliminar todas las alertas de una card
+alerts = metabase_list_notifications(client, card_id=7711)
+for a in alerts:
+    metabase_delete_notification(client, a["id"])
+```
+
+## Notas
+
+La operacion es irreversible. Para desactivar temporalmente usar metabase_update_notification con active=False.
+Elimina tanto alertas de cards (notification/card) como suscripciones de dashboards (notification/dashboard).