feat(proxy): add --ue4ss-path command line/launch arg

[narknon]

Description

This PR adds a new command line option --ue4ss-path <path> to the proxy generator, allowing users to specify a custom path to UE4SS.dll when launching games. This complements the existing --disable-ue4ss option and provides developers with flexible control over which UE4SS build to load.

Fixes # (issue) (if applicable)

Type of change

• New feature (non-breaking change which adds functionality)
• Is/requires documentation update

How has this been tested?

Launches from different directories as expected.

Checklist

• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• I have added the necessary description of this PR to the changelog, and I have followed the same format as other entries.

Screenshots

Additional context

[github-actions]

Build Details

Name	Information
PR Commit	476846d
Merge Commit	5c2bde4
Size	55.45 MB
Last Updated	Nov 5, 25, 11:03:55 PM UTC
Expires At	Nov 19, 25, 11:03:49 PM UTC

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Build Details

Name	Information
PR Commit	476846d
Merge Commit	5c2bde4
Size	45.04 MB
Last Updated	Nov 5, 25, 11:08:36 PM UTC
Expires At	Nov 19, 25, 11:08:32 PM UTC