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_create_card.md

@@ -0,0 +1,35 @@
+---
+name: metabase_create_card
+kind: function
+lang: py
+domain: infra
+version: "1.0.0"
+purity: impure
+signature: "def metabase_create_card(client: MetabaseClient, name: str, dataset_query: dict, display: str = 'table', collection_id: int = 0, description: str = '') -> dict"
+description: "Crea una card/pregunta en Metabase con query SQL nativa o MBQL. Endpoint: POST /api/card."
+tags: [metabase, card, question, create, 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
+card = metabase_create_card(client, "Revenue", {
+    "database": 1, "type": "native",
+    "native": {"query": "SELECT SUM(total) FROM orders"},
+}, display="scalar")
+```
+
+## Notas
+
+dataset_query SQL nativo: `{"database": id, "type": "native", "native": {"query": "..."}}`
+dataset_query MBQL: `{"database": id, "type": "query", "query": {"source-table": id, ...}}`