FancyZones CLI: migrate to System.CommandLine and centralize data I/O (#44344)

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## Summary of the Pull Request
This PR refactors FancyZones CLI to use System.CommandLine and
consolidates all FancyZones JSON config read/write through
FancyZonesEditorCommon data models and FancyZonesDataIO, so CLI and
Editor share the same serialization and file paths.

For detailed command definitions, see PR #44078
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- [ ] Closes: #xxx
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- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
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src/modules/fancyzones/FancyZonesEditorCommon/Data/FancyZonesPaths.cs

@@ -0,0 +1,32 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.IO;
+
+namespace FancyZonesEditorCommon.Data;
+
+/// <summary>
+/// Provides paths to FancyZones configuration files.
+/// </summary>
+public static class FancyZonesPaths
+{
+    private static readonly string DataPath = Path.Combine(
+        Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+        "Microsoft",
+        "PowerToys",
+        "FancyZones");
+
+    public static string AppliedLayouts => Path.Combine(DataPath, "applied-layouts.json");
+
+    public static string CustomLayouts => Path.Combine(DataPath, "custom-layouts.json");
+
+    public static string LayoutTemplates => Path.Combine(DataPath, "layout-templates.json");
+
+    public static string LayoutHotkeys => Path.Combine(DataPath, "layout-hotkeys.json");
+
+    public static string EditorParameters => Path.Combine(DataPath, "editor-parameters.json");
+
+    public static string DefaultLayouts => Path.Combine(DataPath, "default-layouts.json");
+}