feat(metabase): expansion de funciones Python — documents, collections, permissions, validation

Añade un conjunto amplio de funciones al paquete python/functions/metabase:
- Nuevos modulos: collections.py, documents.py, maintenance.py, permissions.py, validation.py (+ test).
- Ampliacion de cards.py, dashboards.py, client.py e __init__.py para exponer las nuevas operaciones.
- Funciones de documentos (create/get/update/delete/archive/copy/move + comentarios), grupos y memberships, permission/collection graphs, copy/move de cards y dashboards, validacion de MBQL/SQL y payloads, actualizacion segura de dashboards y fix_null_ratio.
- .md por funcion con frontmatter para que fn index los registre.
- Actualiza pyproject.toml y uv.lock con las dependencias resultantes.

Impacto: ampliamente mas cobertura de la API de Metabase desde el registry, reutilizable por apps y analisis. No toca Go ni frontend.
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---
name: metabase_validate_dashboard_payload
kind: function
lang: py
domain: infra
version: "1.0.0"
purity: pure
signature: "def metabase_validate_dashboard_payload(payload: dict, known_card_ids: set[int]) -> list[str]"
description: "Valida la estructura de un payload de dashboard de Metabase sin red. Verifica campos obligatorios, bounds de dashcards, referencias a cards conocidas y solapamientos entre dashcards. Acumula todos los issues."
tags: [metabase, validation, dashboard, dashcard, overlap, pure, pre-flight, structural]
uses_functions: []
uses_types: []
returns: []
returns_optional: false
error_type: ""
imports: []
params:
- name: payload
desc: "dict con los campos del dashboard a validar: name, dashcards (opcional), tabs (opcional), parameters (opcional)"
- name: known_card_ids
desc: "conjunto de IDs enteros de cards que existen en Metabase; las dashcards con card_id entero deben referenciar un ID de este conjunto. Pasar set vacio si no se quiere verificar referencias."
output: "lista de strings describiendo cada issue encontrado; lista vacia indica payload valido listo para enviarse a PUT /api/dashboard/:id"
tested: true
tests:
- "dashboard valido sin dashcards"
- "dashboard valido con dashcards"
- "dashboard card id desconocido"
- "dashboard card virtual null permitido"
- "dashboard dashcards solapadas"
- "dashboard dashcards adyacentes no solapan"
- "dashboard col fuera de bounds"
- "dashboard col mas size x excede grid"
- "dashboard size y fuera de bounds"
- "dashboard name ausente"
- "dashboard tabs invalidos"
- "dashboard parameters no list"
test_file_path: "python/functions/metabase/validation_test.py"
file_path: "python/functions/metabase/validation.py"
---
## Ejemplo
```python
known_ids = {c["id"] for c in metabase_list_cards(client)}
issues = metabase_validate_dashboard_payload(dashboard_payload, known_card_ids=known_ids)
if issues:
print("Dashboard invalido:")
for issue in issues:
print(f" - {issue}")
else:
metabase_update_dashboard(client, dashboard_id, **dashboard_payload)
```
## Notas
Bounds del grid de Metabase:
- `col` in [0, 23], `row` >= 0
- `size_x` in [1, 24], `size_y` in [1, 100]
- `col + size_x <= 24` (no exceder el ancho del grid)
Deteccion de solapamientos: O(n^2) sobre pares de dashcards. Optimo para dashboards tipicos (< 50 cards).
Dashcards con `card_id = null` son virtuales (texto, headings, iframes) y se permiten sin verificar contra known_card_ids.