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_dashboard.md

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+---
+name: metabase_create_dashboard
+kind: function
+lang: py
+domain: infra
+version: "1.0.0"
+purity: impure
+signature: "def metabase_create_dashboard(client: MetabaseClient, name: str, description: str = '', collection_id: int = 0) -> dict"
+description: "Crea dashboard vacio en Metabase. Para agregar cards usar metabase_update_dashboard con dashcards. Endpoint: POST /api/dashboard."
+tags: [metabase, dashboard, 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/dashboards.py"
+---
+
+## Ejemplo
+
+```python
+dash = metabase_create_dashboard(client, "Sales Overview", "KPIs")
+# Agregar cards con metabase_update_dashboard
+```
+
+## Notas
+
+Se crea vacio. Agregar cards con metabase_update_dashboard(dashcards=[...]).