Enable Central Package Management

[Copilot]

This PR implements Central Package Management for the FShopOnWeb repository to streamline dependency management and ensure consistent package versions across all projects.

Changes Made

Core Implementation

• Created Directory.Packages.props - Centralized package version definitions for all NuGet packages
• Updated project files - Removed version attributes from all PackageReference elements
• Enabled central management - Set ManagePackageVersionsCentrally=true

Documentation & Testing

• Enhanced README.md - Added comprehensive section explaining Central Package Management
• Added validation tests - Created CentralPackageManagementTests.fs to verify proper configuration
• Updated lock files - Regenerated to reflect centralized package management

Benefits

✅ Consistency - All projects now use identical package versions
✅ Maintainability - Package updates happen in one central location
✅ Reduced conflicts - Eliminates version mismatches between projects
✅ Simplified updates - Easier to upgrade packages across the entire solution

Package Versions Managed Centrally

Package	Version	Usage
EntityFrameworkCore.FSharp	6.0.7	Main app & tests
Falco	4.0.6	Web framework
Microsoft.EntityFrameworkCore.Sqlite	9.0.6	Data access
Microsoft.EntityFrameworkCore.InMemory	9.0.0	Testing
xunit	2.9.2	Unit testing
Microsoft.NET.Test.Sdk	17.12.0	Test framework

How to Add New Packages

1. Add version to Directory.Packages.props:

   <PackageVersion Include="PackageName" Version="1.0.0" />

2. Reference in project without version:

   <PackageReference Include="PackageName" />

Validation

• ✅ All existing tests pass
• ✅ Build succeeds with centralized packages
• ✅ New tests validate Central Package Management configuration
• ✅ Lock files ensure reproducible builds

Fixes #16

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[KyleMcMaster]

@copilot please try again