Restructure template, add configurable description, remove comments

- Remove LoadPriority override from EntryPoint.cs (defaults to Medium)
- Add Description property (was already templated as a literal, now a
  configurable PluginDescription symbol like PluginAuthor)
- Move the buildable project into content/ so CLAUDE.md, .editorconfig,
  and .gitignore never ship in a generated plugin, and the project no
  longer shares its root with them
- Remove the SkipGit symbol and its manual-instructions postAction:
  automatic git init on generation was re-verified impossible (no
  --allow-scripts equivalent on dotnet 10 SDK to bypass the Run Script
  postAction's interactive Y/N gate); VS's own New Project checkbox
  already covers this
- Add content/CLAUDE.md so every generated plugin ships with LabAPI/
  toolchain/code-style context for Claude Code, since no C#/.NET/LabAPI
  Skill exists in the catalog
- Set PluginAuthor/PluginDescription defaultValue to generic "Your
  Name"/"Your Description" placeholders instead of "YourName"/a TODO
  string
- Strip all comments from the .csproj (project code style forbids them)

Verified by generating a project from the reinstalled template and
running dotnet build (0 warnings, 0 errors) after each change.

content/LabApiPluginTemplate.csproj

@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.1</TargetFramework>
+    <LangVersion>14.0</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>disable</ImplicitUsings>
+    <RootNamespace>LabApiPluginTemplate</RootNamespace>
+    <AssemblyName>LabApiPluginTemplate</AssemblyName>
+    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <NoWarn>$(NoWarn);NU1701</NoWarn>
+    <ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>None</ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Northwood.LabAPI" Version="*">
+      <NoWarn>NU1701</NoWarn>
+    </PackageReference>
+  </ItemGroup>
+
+</Project>