feat(crm): dominio backend (cuentas, contactos, prospectos, embudos, oportunidades, actividades)

- Nuevo schema `crm` con 7 tablas multi-tenant (TenantScopedMixin + soft delete)
- Módulos FastAPI por dominio: models/dto/service/routes (patrón example)
- Métricas del dashboard (KPIs + embudo por etapa)
- Conversión de prospecto → cuenta/contacto/oportunidad (idempotente)
- Movimiento de oportunidad entre etapas (Kanban) con estado/probabilidad derivados
- 25 permisos registrados en PermissionRegistry
- Migración Alembic con upgrade/downgrade completos
- 24 tests de servicios (pytest) en verde

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/api/v1/modules/crm/activities/routes.py

@@ -0,0 +1,85 @@
+from fastapi import APIRouter, Depends, Query, status
+from sqlalchemy.orm import Session
+
+from core.database import get_core_db
+from core.security import get_current_user
+
+from . import service
+from .dto import ActivityCreate, ActivityResponse, ActivityUpdate
+
+router = APIRouter()
+
+
+@router.get("/activities", response_model=list[ActivityResponse])
+def list_activities(
+    company_id: int = Query(..., description="Company ID"),
+    activity_type: str | None = Query(None, description="Filtrar por tipo"),
+    activity_status: str | None = Query(None, alias="status", description="Filtrar por estado"),
+    account_id: int | None = Query(None),
+    contact_id: int | None = Query(None),
+    lead_id: int | None = Query(None),
+    opportunity_id: int | None = Query(None),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    tenant_id = current_user["tenant_id"]
+    return service.get_activities(
+        db, tenant_id, company_id, activity_type, activity_status,
+        account_id, contact_id, lead_id, opportunity_id,
+    )
+
+
+@router.get("/activities/{activity_id}", response_model=ActivityResponse)
+def get_activity(
+    activity_id: int,
+    company_id: int = Query(..., description="Company ID"),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    tenant_id = current_user["tenant_id"]
+    return service.get_activity(db, activity_id, tenant_id, company_id)
+
+
+@router.post("/activities", response_model=ActivityResponse, status_code=status.HTTP_201_CREATED)
+def create_activity(
+    payload: ActivityCreate,
+    company_id: int = Query(..., description="Company ID"),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    tenant_id = current_user["tenant_id"]
+    return service.create_activity(db, payload, tenant_id, company_id)
+
+
+@router.patch("/activities/{activity_id}", response_model=ActivityResponse)
+def update_activity(
+    activity_id: int,
+    payload: ActivityUpdate,
+    company_id: int = Query(..., description="Company ID"),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    tenant_id = current_user["tenant_id"]
+    return service.update_activity(db, activity_id, payload, tenant_id, company_id)
+
+
+@router.patch("/activities/{activity_id}/complete", response_model=ActivityResponse)
+def complete_activity(
+    activity_id: int,
+    company_id: int = Query(..., description="Company ID"),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    tenant_id = current_user["tenant_id"]
+    return service.complete_activity(db, activity_id, tenant_id, company_id)
+
+
+@router.delete("/activities/{activity_id}", status_code=status.HTTP_204_NO_CONTENT)
+def delete_activity(
+    activity_id: int,
+    company_id: int = Query(..., description="Company ID"),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    tenant_id = current_user["tenant_id"]
+    service.delete_activity(db, activity_id, tenant_id, company_id)