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/tenants/models.py

@@ -1,6 +1,7 @@
 """
 Modelos ORM para gestión de tenants
 """
+
 from sqlalchemy import Column, Integer, String, DateTime, Boolean, Text, Enum as SQLEnum
 from sqlalchemy.sql import func
 from sqlalchemy.orm import Mapped, mapped_column, relationship
@@ -15,6 +16,7 @@ if TYPE_CHECKING:
 
 class TenantType(enum.Enum):
     """Tipo de tenant según tamaño y necesidades"""
+
     SHARED = "shared"  # BD compartida
     DEDICATED = "dedicated"  # BD dedicada
 
@@ -24,37 +26,44 @@ class Tenant(Base):
     Modelo de Tenant - Cliente/Organización en el sistema
     Cada tenant puede tener BD compartida o dedicada
     """
+
     __tablename__ = "tenants"
     __table_args__ = {"schema": "a76"}
-    
+
     id = Column(Integer, primary_key=True, index=True)
     name = Column(String(255), nullable=False, index=True)
     slug = Column(String(100), unique=True, nullable=False, index=True)
-    
+
     # Tipo de tenant (compartido o dedicado)
     type = Column(SQLEnum(TenantType), default=TenantType.SHARED, nullable=False)
-    
+
     # Keycloak realm asociado
     keycloak_realm = Column(String(255), nullable=False)
-    
+
     # Configuración de BD dedicada (JSON string o NULL si usa BD compartida)
     db_config = Column(Text, nullable=True)  # JSON: {host, port, name, user, password}
-    
+
     # Información de contacto
     contact_name = Column(String(255))
     contact_email = Column(String(255))
     contact_phone = Column(String(50))
-    
+
     # Estado
     is_active = Column(Boolean, default=True, nullable=False)
-    
+
     # Timestamps
-    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=func.now())
-    updated_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=func.now(), onupdate=func.now())
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime, nullable=False, default=func.now()
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime, nullable=False, default=func.now(), onupdate=func.now()
+    )
     deleted_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
-    
+
     # Relación con UserTenant
-    user_relations: Mapped[List["UserTenant"]] = relationship("UserTenant", back_populates="tenant")
-    
+    user_relations: Mapped[List["UserTenant"]] = relationship(
+        "UserTenant", back_populates="tenant"
+    )
+
     def __repr__(self):
         return f"<Tenant(id={self.id}, name={self.name}, type={self.type.value})>"