Give each project its own package metadata and make Internal.AspNet packable

Move the package Description out of Directory.Build.props into each csproj
so every package describes itself. Convert Internal.AspNet from the Web SDK
(which disables packaging) to Microsoft.NET.Sdk with a Microsoft.AspNetCore.App
framework reference so it builds and packs as a proper library.

Author: hhvrc

Directory.Build.props

@@ -6,7 +6,6 @@
 
     <Title>$(Product)</Title>
     <Authors>OpenShock</Authors>
-    <Description>Internal shared .NET libraries for the OpenShock backend</Description>
     <RepositoryUrl>https://github.com/OpenShock/Internal.Net</RepositoryUrl>
     <PackageProjectUrl>https://openshock.org</PackageProjectUrl>
     <PackageId>$(Product.Replace(" ", "_"))</PackageId>

Internal.AspNet/Internal.AspNet.csproj

@@ -1,8 +1,13 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Library</OutputType>
+    <Description>ASP.NET Core extensions (controllers, exception handling, problem details) for the OpenShock backend.</Description>
   </PropertyGroup>
 
+  <ItemGroup>
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\Internal.Common\Internal.Common.csproj" />
   </ItemGroup>

Internal.Common/Internal.Common.csproj

@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Library</OutputType>
+    <Description>Shared utilities, validation, cryptography, and geolocation helpers for the OpenShock backend.</Description>
   </PropertyGroup>
 
   <ItemGroup>

Internal.DynamicLinq/Internal.DynamicLinq.csproj

@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Library</OutputType>
+    <Description>Dynamic LINQ query builder for PostgreSQL via EF Core, used by the OpenShock backend.</Description>
   </PropertyGroup>
 
   <ItemGroup>