Add filter debug page

ProjectLighthouse/Pages/Debug/FilterTestPage.cshtml

@@ -0,0 +1,22 @@
+@page "/debug/filter"
+@model LBPUnion.ProjectLighthouse.Pages.Debug.FilterTestPage
+
+@{
+    Layout = "Layouts/BaseLayout";
+    Model.Title = "Debug - Filter Test";
+}
+
+@if (Model.FilteredText != null)
+{
+    <p>@Model.FilteredText</p>
+}
+
+<form>
+    <div class="ui right action input">
+        <input type="text" name="text" placeholder="Text to be filtered" value="@(Model.Text ?? "")">
+        <button type="submit" class="ui blue button">
+            <i class="pen icon"></i>
+            Filter
+        </button>
+    </div>
+</form>

ProjectLighthouse/Pages/Debug/FilterTestPage.cshtml.cs

@@ -0,0 +1,28 @@
+#nullable enable
+using System.Threading.Tasks;
+using LBPUnion.ProjectLighthouse.Helpers;
+using LBPUnion.ProjectLighthouse.Pages.Layouts;
+using Microsoft.AspNetCore.Mvc;
+
+namespace LBPUnion.ProjectLighthouse.Pages.Debug;
+
+public class FilterTestPage : BaseLayout
+{
+    public FilterTestPage(Database database) : base(database)
+    {}
+
+    public string? FilteredText = null;
+    public string? Text = null;
+
+    public async Task<IActionResult> OnGet(string? text = null)
+    {
+        #if !DEBUG
+        return this.NotFound();
+        #endif
+
+        if (text != null) this.FilteredText = CensorHelper.ScanMessage(text);
+        this.Text = text;
+
+        return this.Page();
+    }
+}