v1.2.0 - Tag Filter & Category Management

Features

• Tag-based filtering on challenges, prebuild, and store pages (OR/union logic)
• Searchable tag bar with expand/collapse — default shows 10 tags, click "更多" to expand, supports search
• Category management bar — bulk enable/disable all challenges in a category (AD, argus, custom, vulhub, xbow)
• Batch APIs (/api/batch_visibility, /api/batch_start, /api/batch_stop) that respect tag filter scope
• Tags displayed on challenge cards — small grey pills showing each challenge's tags
• Styled confirmation modal for all bulk operations (replaces browser confirm())

Fixes

• Level 4 (AD) challenges now correctly score 1000 points (was 0)
• Removed empty "Challenges Summary" table from startup CLI output
• Fixed tag bar FOUC (flash of unstyled content) on page load
• Fixed data-tags JSON parsing error (HTML attribute quoting)