Actualizo app.py y requirements

app.py

@@ -235,7 +235,12 @@ with gr.Blocks(title="Pronóstico por SKU (Chronos-T5)") as demo:
     )
     with gr.Row():
         file = gr.File(label="CSV (sku,date,value o date,value)", file_types=[".csv"])
-        sku_dd = gr.Dropdown(choices=[], value=None, label="SKU (si el CSV tiene columna 'sku')")
+        sku_dd = gr.Dropdown(
+    choices=[], value=None,
+    label="SKU (si el CSV tiene columna 'sku')",
+    allow_custom_value=True
+)
+
         horizon = gr.Slider(1, 36, value=12, step=1, label="Horizonte (pasos)")
         freq = gr.Dropdown(choices=["", "D", "W", "MS", "M"], value="MS",
                            label="Frecuencia. ''=inferir, MS=mensual")