Add SmartResolve plugin for duplicate scene workflows

[Stash-KennyG]

Summary

• Add a new SmartResolve plugin under plugins/SmartResolve for Stash Duplicate Checker workflows.
• Include rule-based keeper selection with protection/sync safeguards to reduce metadata loss during duplicate cleanup.
• Include Smart Resolve UI assets and docs (README.md + settings screenshot) so behavior and configuration are clear in CommunityScripts.

Test plan

• Install/update plugin and verify SmartResolve loads in Duplicate Checker.
• Run Smart Resolve and confirm reasons/selection output is generated across duplicate groups.
• Validate sync protections (group/performer/tag/date/o-count/ignore-tag rules) on known edge-case pairs.
• Verify settings toggles in plugin config alter rule/protection behavior as expected.

LLM Details

• [✔] LLM use is openly disclosed. Made with Cursor
• [✔] Code is reviewed by a human. Human reviewed
• [✔] Human testing and validation was performed. I filtered through hundreds of scenes testing the code.
• [✔] You take full responsibility for the code (including license compliance).

Notes

This works VERY well for all matches exact matches
It does struggle a little bit with performance for VERY large (100k) libraries with fuzzier matches. It's not that it's altering the matches but it just is not perfectly efficient and triggers some re-queries that are expensive and causses the overall UI to be a little sluggish in the match review segment. Still very helpful.

[Stash-KennyG]

Latest push removes unnecessary refresh, greatly improving performance.