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/accounts/dto.py

@@ -0,0 +1,67 @@
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict, EmailStr, Field
+
+
+class AccountCreate(BaseModel):
+    name: str = Field(..., min_length=1, max_length=255)
+    trade_name: str | None = Field(None, max_length=255)
+    rfc: str | None = Field(None, max_length=13)
+    account_type: str | None = Field(None, max_length=40)
+    industry: str | None = Field(None, max_length=120)
+    email: EmailStr | None = None
+    phone: str | None = Field(None, max_length=40)
+    website: str | None = Field(None, max_length=255)
+    address: str | None = None
+    city: str | None = Field(None, max_length=120)
+    state: str | None = Field(None, max_length=120)
+    country: str | None = Field(None, max_length=2)
+    patente_aduanal: str | None = Field(None, max_length=20)
+    status: str = Field("active", max_length=20)
+    owner_user_id: str | None = Field(None, max_length=64)
+    notes: str | None = None
+
+
+class AccountUpdate(BaseModel):
+    name: str | None = Field(None, min_length=1, max_length=255)
+    trade_name: str | None = Field(None, max_length=255)
+    rfc: str | None = Field(None, max_length=13)
+    account_type: str | None = Field(None, max_length=40)
+    industry: str | None = Field(None, max_length=120)
+    email: EmailStr | None = None
+    phone: str | None = Field(None, max_length=40)
+    website: str | None = Field(None, max_length=255)
+    address: str | None = None
+    city: str | None = Field(None, max_length=120)
+    state: str | None = Field(None, max_length=120)
+    country: str | None = Field(None, max_length=2)
+    patente_aduanal: str | None = Field(None, max_length=20)
+    status: str | None = Field(None, max_length=20)
+    owner_user_id: str | None = Field(None, max_length=64)
+    notes: str | None = None
+
+
+class AccountResponse(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    name: str
+    trade_name: str | None
+    rfc: str | None
+    account_type: str | None
+    industry: str | None
+    email: str | None
+    phone: str | None
+    website: str | None
+    address: str | None
+    city: str | None
+    state: str | None
+    country: str | None
+    patente_aduanal: str | None
+    status: str
+    owner_user_id: str | None
+    notes: str | None
+    tenant_id: int
+    company_id: int
+    created_at: datetime
+    updated_at: datetime