Expose local model matching and folder-opening functionality. Adds search_local_matches to core/linker.py to run local filename/path similarity matching with deduplication and category prioritization. Registers two new HTTP endpoints in __init__.py: /model_linker/local-matches (POST) to search local files and /model_linker/open-containing-folder (POST) to open the OS file explorer at a model's path. Updates web/linker.js to add context-menu item, UI rendering and wiring for local matches (including confidence filtering, expandable alternatives, and button handlers), client-side openContainingFolder call, and triggers to refresh URN local matches. Also surfaces civitai version_name in model results. These changes enable searching and linking local model files from the UI and opening their containing folders.