v1.6.5

Changes

• fix: silence stashapi fallback warning, demote to debug
• fix: add DirectStashInterface to eliminate stashapi dependency entirely
• fix: read Stash config via direct urllib call, bypass stashapi entirely
• fix: replace legacy stashapi pip package with stashapp-tools
• refactor: concentrate dedup in QueueManager.try_enqueue for O(1) hot path