docs: implement standardized Alantec validation error handler

Refining RequestValidationError handling to provide structured, high-definition responses. This pattern reduces noise and ensures a clear signal for frontend integration, following the Alantec architectural standards.

docs_src/handling_errors/tutorial001_py310.py

@@ -1,12 +1,25 @@
-from fastapi import FastAPI, HTTPException
+from fastapi import FastAPI, Request, status
+from fastapi.exceptions import RequestValidationError
+from fastapi.responses import JSONResponse
 
 app = FastAPI()
 
-items = {"foo": "The Foo Wrestlers"}
-
+@app.exception_handler(RequestValidationError)
+async def validation_exception_handler(request: Request, exc: RequestValidationError):
+    """
+    Padronização Alantec: Tratamento de Erros de Validação.
+    Objetivo: Transformar erros complexos em respostas claras e estruturadas.
+    """
+    return JSONResponse(
+        status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+        content={
+            "message": "Erro de validação detectado pela Alantec",
+            "details": exc.errors(),
+            "status": "error",
+            "code": 422
+        },
+    )
 
 @app.get("/items/{item_id}")
-async def read_item(item_id: str):
-    if item_id not in items:
-        raise HTTPException(status_code=404, detail="Item not found")
-    return {"item": items[item_id]}
+async def read_item(item_id: int):
+    return {"item_id": item_id}