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/core/config.py

@@ -1,26 +1,27 @@
 """
 Configuración centralizada de la aplicación usando Pydantic Settings
 """
+
 from pydantic_settings import BaseSettings, SettingsConfigDict
 from typing import List
 
 
 class Settings(BaseSettings):
     """Configuración de la aplicación"""
-    
+
     # Application
     APP_NAME: str = "Anexo76"
     APP_VERSION: str = "1.0.0"
     DEBUG: bool = True
     ENVIRONMENT: str = "development"
-    
+
     # Database - Core (Shared)
     CORE_DB_HOST: str = "postgres-a76"
     CORE_DB_PORT: int = 5432
     CORE_DB_NAME: str = "anexo76_core"
     CORE_DB_USER: str = "postgres"
     CORE_DB_PASSWORD: str = "postgres"
-    
+
     # Keycloak
     KEYCLOAK_SERVER_URL: str = "http://localhost:8080"
     KEYCLOAK_REALM: str = "master"
@@ -28,34 +29,32 @@ class Settings(BaseSettings):
     KEYCLOAK_CLIENT_SECRET: str = ""
     KEYCLOAK_ADMIN_USERNAME: str = "admin"
     KEYCLOAK_ADMIN_PASSWORD: str = "admin"
-    
+
     # Security
     SECRET_KEY: str = "change-this-secret-key-in-production"
     ALGORITHM: str = "HS256"
     ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
-    
+
     # CORS
     CORS_ORIGINS: str = "http://localhost:5173,http://localhost:3000"
-    
+
     # License
     LICENSE_CHECK_ENABLED: bool = True
-    
+
     model_config = SettingsConfigDict(
-        env_file=".env",
-        case_sensitive=True,
-        extra="ignore"
+        env_file=".env", case_sensitive=True, extra="ignore"
     )
-    
+
     @property
     def core_database_url(self) -> str:
         """URL de conexión a la base de datos core"""
         return f"postgresql://{self.CORE_DB_USER}:{self.CORE_DB_PASSWORD}@{self.CORE_DB_HOST}:{self.CORE_DB_PORT}/{self.CORE_DB_NAME}"
-    
+
     @property
     def async_core_database_url(self) -> str:
         """URL de conexión asíncrona a la base de datos core"""
         return f"postgresql+asyncpg://{self.CORE_DB_USER}:{self.CORE_DB_PASSWORD}@{self.CORE_DB_HOST}:{self.CORE_DB_PORT}/{self.CORE_DB_NAME}"
-    
+
     @property
     def cors_origins_list(self) -> List[str]:
         """Lista de orígenes CORS permitidos"""