Refactor APPLYDUHIVE HKCU path discovery

[jacksyrm]

Questions

• Did you test your changes or double-check that they work?
• Did you read and follow the Atlas Contribution Guidelines?

Describe your pull request

• simplify APPLYDUHIVE by extracting HKCU registry paths from tweak YAML content directly
• keep path collection deterministic and case-insensitive before syncing values to the default user hive
• reduce coupling to YAML object parsing logic while preserving existing copy behavior

[TheyCreeper]

Lgtm