feat: add fixed asset classes management page and embed functionality

- Implemented a new page for managing fixed asset classes with full CRUD functionality.
- Added filtering options for searching classes by code, description, type, and fraction.
- Integrated dialogs for inserting, editing, and deleting classes with validation.
- Enhanced error handling and user feedback with toast notifications.
- Created an embedded iframe for the fixed asset classes page in the merchandise section.

backend/api/v1/modules/a76/classes/routes.py

@@ -2,13 +2,19 @@
 Endpoints API para gestión de clases SCAII y SCAF
 """
 
-from api.v1.common.tenant_crud_routes import TenantCRUDRoutes
+from typing import Dict, Any
+from fastapi import Depends, Query
+from sqlalchemy.orm import Session
 
-from .dto import ClassCreateDTO, ClassResponseDTO, ClassUpdateDTO
+from core.database import get_core_db
+from core.security import get_current_user
+from api.v1.common.tenant_crud_routes import TenantCRUDRoutes, validate_access_to_resource
+
+from .dto import ClassCreateDTO, ClassCreateDTOFA, ClassResponseDTO, ClassResponseDTOFA, ClassUpdateDTO
 from .service import ClassService
 
 # Create router with generic CRUD routes
-router = TenantCRUDRoutes(
+crud_routes = TenantCRUDRoutes(
     service=ClassService,
     create_schema=ClassCreateDTO,
     update_schema=ClassUpdateDTO,
@@ -16,9 +22,58 @@ router = TenantCRUDRoutes(
     prefix="/classes",
     tags=["a76 / classes"],
     resource_name="Class",
-    id_name="class_id",
+    id_name="id",
     enable_list=True,
     enable_filters=True,
     default_page_size=50,
-    max_page_size=100,
-).router
+    max_page_size=1000,
+)
+
+router = crud_routes.router
+
+
+@router.post(
+    "/seed",
+    summary="Seed Fixed Asset Classes",
+    description="Initialize fixed asset class catalog with default data",
+)
+async def seed_classes(
+    company_id: int = Query(..., description="Company ID"),
+    client_id: int = Query(..., description="Client ID"),
+    db: Session = Depends(get_core_db),
+    current_user: Dict[str, Any] = Depends(get_current_user),
+):
+    """Seed initial data for fixed asset classes"""
+    tenant_id = validate_access_to_resource(db, company_id, current_user)
+    
+    count = ClassService.seed_initial_data(db, tenant_id, company_id, client_id)
+    
+    return {
+        "message": f"Successfully created {count} fixed asset classes",
+        "count": count,
+    }
+
+
+@router.post(
+    "/fa",
+    response_model=ClassResponseDTOFA,
+    status_code=201,
+    summary="Create Fixed Asset Class",
+    description="Create a class with FA extension in a single transaction",
+)
+async def create_fa_class(
+    class_data: ClassCreateDTOFA,
+    company_id: int = Query(..., description="Company ID"),
+    db: Session = Depends(get_core_db),
+    current_user: Dict[str, Any] = Depends(get_current_user),
+):
+    """Create a fixed asset class (both base class and FA extension)"""
+    import logging
+    logger = logging.getLogger(__name__)
+    logger.info(f"create_fa_class endpoint called with: {class_data.model_dump()}")
+    
+    tenant_id = validate_access_to_resource(db, company_id, current_user)
+    
+    result = ClassService.create_fa_class(db, class_data, tenant_id, company_id)
+    
+    return result