feat: funciones Python para API Metabase

Añade módulo Python con funciones para la API de Metabase en dominio infra.
Incluye cliente HTTP, auth, y CRUD de cards, dashboards y users.
Proyecto gestionado con uv (pyproject.toml).

python/functions/metabase/metabase_execute_query.md

@@ -0,0 +1,32 @@
+---
+name: metabase_execute_query
+kind: function
+lang: py
+domain: infra
+version: "1.0.0"
+purity: impure
+signature: "def metabase_execute_query(client: MetabaseClient, database_id: int, sql: str, max_results: int = 0) -> dict"
+description: "Ejecuta query SQL ad-hoc contra Metabase sin guardarla como card. Util para exploracion rapida. Endpoint: POST /api/dataset."
+tags: [metabase, query, execute, sql, dataset, api, python]
+uses_functions: []
+uses_types: []
+returns: []
+returns_optional: false
+error_type: "error_go_core"
+imports: [httpx]
+tested: false
+tests: []
+test_file_path: ""
+file_path: "python/functions/metabase/cards.py"
+---
+
+## Ejemplo
+
+```python
+result = metabase_execute_query(client, 1, "SELECT * FROM users LIMIT 10")
+print(f"{result['row_count']} filas en {result['running_time']}ms")
+```
+
+## Notas
+
+Misma respuesta que metabase_execute_card. Default 2000 filas, override con max_results.