fix: improve FilePersistenceService code quality and security

wanshenmean

2026-03-13 efbfb630f60f6663deba83ec12c1fbf2f9bab183

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@using WIDESEAWCS_S7Simulator.Web
@namespace WIDESEAWCS_S7Simulator.Web.Pages
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers