refactor: Migrates solution to .slnx format

Replaces the traditional .sln file with a .slnx file for improved solution management. Organizes projects into logical folders within the solution, enhancing readability and navigation.

Includes a new .DotSettings file for solution-level ReSharper settings.

Author: newbe36524

HagiCode.Libs.sln

@@ -0,0 +1,2 @@
+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=Hagi/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

HagiCode.Libs.sln.DotSettings

@@ -0,0 +1,25 @@
+<Solution>
+  <Configurations>
+    <Platform Name="Any CPU" />
+    <Platform Name="x64" />
+    <Platform Name="x86" />
+  </Configurations>
+  <Folder Name="/integrationTests/">
+    <Project Path="src/HagiCode.Libs.CiSetup.Console/HagiCode.Libs.CiSetup.Console.csproj" />
+    <Project Path="src/HagiCode.Libs.ClaudeCode.Console/HagiCode.Libs.ClaudeCode.Console.csproj" />
+    <Project Path="src/HagiCode.Libs.Codebuddy.Console/HagiCode.Libs.Codebuddy.Console.csproj" />
+    <Project Path="src/HagiCode.Libs.Codex.Console/HagiCode.Libs.Codex.Console.csproj" />
+    <Project Path="src/HagiCode.Libs.ConsoleTesting/HagiCode.Libs.ConsoleTesting.csproj" />
+    <Project Path="src/HagiCode.Libs.Hermes.Console/HagiCode.Libs.Hermes.Console.csproj" />
+    <Project Path="src/HagiCode.Libs.QoderCli.Console/HagiCode.Libs.QoderCli.Console.csproj" />
+  </Folder>
+  <Folder Name="/src/">
+    <Project Path="src/HagiCode.Libs.Core/HagiCode.Libs.Core.csproj" />
+    <Project Path="src/HagiCode.Libs.Providers/HagiCode.Libs.Providers.csproj" />
+  </Folder>
+  <Folder Name="/tests/">
+    <Project Path="tests/HagiCode.Libs.ConsoleTesting.Tests/HagiCode.Libs.ConsoleTesting.Tests.csproj" />
+    <Project Path="tests/HagiCode.Libs.Core.Tests/HagiCode.Libs.Core.Tests.csproj" />
+    <Project Path="tests/HagiCode.Libs.Providers.Tests/HagiCode.Libs.Providers.Tests.csproj" />
+  </Folder>
+</Solution>