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_get_dashboard.md

@@ -0,0 +1,33 @@
+---
+name: metabase_get_dashboard
+kind: function
+lang: py
+domain: infra
+version: "1.0.0"
+purity: impure
+signature: "def metabase_get_dashboard(client: MetabaseClient, dashboard_id: int) -> dict"
+description: "Obtiene dashboard completo con dashcards (cards posicionadas), tabs y parametros. Endpoint: GET /api/dashboard/:id."
+tags: [metabase, dashboard, get, 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_get_dashboard(client, 1)
+for dc in dash["dashcards"]:
+    print(f"Card {dc['card_id']} at ({dc['col']}, {dc['row']})")
+```
+
+## Notas
+
+Cada dashcard tiene: id, card_id, card, size_x, size_y, col, row, dashboard_tab_id, parameter_mappings.