feat: Implement multi-tenancy support in middleware and security layers

- Enhanced TenantMiddleware to validate tenant information from JWT tokens.
- Added LicenseValidationMiddleware to check tenant licenses before processing requests.
- Updated security utilities to extract tenant information from tokens and validate company access.
- Introduced CompanyStore to manage active company state and handle company switching in the frontend.
- Modified API routes to include company_id in requests for better resource management.
- Improved logging and error handling throughout the middleware and API layers.
- Updated frontend components to reflect changes in company management and selection.
- Added new API route for fetching user's companies with proper authentication handling.

backend/api/v1/modules/a76/user_tenant/models.py

@@ -1,7 +1,15 @@
 """
 Modelo de relación entre usuarios (Keycloak) y tenants
 """
-from sqlalchemy import Integer, String, DateTime, Boolean, UniqueConstraint, ForeignKeyConstraint, ForeignKey
+
+from sqlalchemy import (
+    Integer,
+    String,
+    DateTime,
+    Boolean,
+    UniqueConstraint,
+    ForeignKeyConstraint,
+)
 from sqlalchemy.sql import func
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 from datetime import datetime
@@ -11,42 +19,51 @@ from core.database import Base
 if TYPE_CHECKING:
     from api.v1.modules.a76.tenants.models import Tenant
 
+
 class UserTenant(Base):
     """
     Relación muchos-a-muchos entre usuarios de Keycloak y tenants
-    
+
     Un usuario puede pertenecer a múltiples tenants
     Un tenant puede tener múltiples usuarios
     """
+
     __tablename__ = "user_tenants"
     __table_args__ = (
-        ForeignKeyConstraint(['tenant_id'], ['a76.tenants.id']),
-        UniqueConstraint('keycloak_user_id', 'tenant_id', name='uq_user_tenant'),
-        {"schema": "a76"}
+        ForeignKeyConstraint(["company_id"], ["a76.company.id"]),
+        ForeignKeyConstraint(["tenant_id"], ["a76.tenants.id"]),
+        UniqueConstraint(
+            "keycloak_user_id", "tenant_id", "company_id", name="uq_user_tenant"
+        ),
+        {"schema": "a76"},
     )
-    
+
     # Primary Key
     id: Mapped[int] = mapped_column(primary_key=True, index=True)
-    
+
     # ID del usuario en Keycloak (UUID string)
-    keycloak_user_id: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
-    
+    keycloak_user_id: Mapped[str] = mapped_column(
+        String(255), nullable=False, index=True
+    )
+
     # ID del tenant
     tenant_id: Mapped[int] = mapped_column(Integer, nullable=False, index=True)
-    
-    # ID de la empresa asociada
-    company_id: Mapped[int] = mapped_column(Integer, ForeignKey("a76.companies.id"), nullable=False, index=True)
-    
+    company_id: Mapped[int] = mapped_column(Integer, nullable=False, index=True)
+
     # Estado de la relación
     is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
-    
+
     # Información adicional - Rol del usuario en este tenant (opcional)
     role: Mapped[Optional[str]] = mapped_column(String(50), nullable=True)
-    
+
     # Timestamps
-    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, server_default=func.now())
-    updated_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, server_default=func.now(), onupdate=func.now())
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime, nullable=False, server_default=func.now()
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime, nullable=False, server_default=func.now(), onupdate=func.now()
+    )
     deleted_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
-    
+
     # Relación con Tenant
     tenant: Mapped["Tenant"] = relationship("Tenant", back_populates="user_relations")