Allow --force-create to overwrite existing doc version snapshots

[Copilot]

Previously, generating documentation with --doc-version for an already-existing version always threw DuplicateDocVersionNameException — there was no way to update/overwrite a version snapshot.

Changes

• DocVersionManager: Added forceCreate parameter. When true and the version already exists, removes it from versions.json and deletes its directory before regenerating.
• RazorTemplateProcessor: Added forceCreate field; passes it to DocVersionManager. Reordered initialization so DocVersionManager is created before the version directory (enabling cleanup before recreation).
• DefaultTemplateProcessor / Program.cs: Threads forceCreate through from config to the template processor stack.

Usage

# Initial snapshot
refdocgen MyLibrary.dll --doc-version v1.0

# Overwrite existing snapshot
refdocgen MyLibrary.dll --doc-version v1.0 --force-create

Tests

Added DocVersionManagerTests with unit tests covering: exception on duplicate without forceCreate, no exception with forceCreate, old directory deletion, and version list cleanup.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add version snapshots</issue_title>
<issue_description>## Description

Introduce a feature to create automatic version snapshots of documentation. This enhancement will help keep track of changes over time, allowing users to compare and revert if needed. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add version snapshots #242

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