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/main.py

@@ -13,8 +13,10 @@ from core.middleware import (
     RequestLoggingMiddleware,
     TenantMiddleware,
 )
-from fastapi import FastAPI
+from fastapi import FastAPI, Request, status, HTTPException
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.exceptions import RequestValidationError
+from fastapi.responses import JSONResponse
 
 from api.v1.modules.a76.items.models import Item # Importar rutas para registrar con el router
 from api.v1.modules.a76.items.series.models import Serie   # Importar modelos para registrar con SQLAlchemy
@@ -38,6 +40,27 @@ app = FastAPI(
 )
 
 
+# Add validation error handler
+@app.exception_handler(RequestValidationError)
+async def validation_exception_handler(request: Request, exc: RequestValidationError):
+    logger.error(f"Validation error for {request.method} {request.url.path}: {exc.errors()}")
+    logger.error(f"Request body: {await request.body()}")
+    return JSONResponse(
+        status_code=status.HTTP_400_BAD_REQUEST,
+        content={"detail": exc.errors(), "body": exc.body},
+    )
+
+
+# Add HTTP exception handler
+@app.exception_handler(HTTPException)
+async def http_exception_handler(request: Request, exc: HTTPException):
+    logger.error(f"HTTP {exc.status_code} for {request.method} {request.url.path}: {exc.detail}")
+    return JSONResponse(
+        status_code=exc.status_code,
+        content={"detail": exc.detail},
+    )
+
+
 # Inicializar la base de datos
 @app.on_event("startup")
 async def on_startup():