feat: Add search function for File Tree
Features:
1. Search UI
- Search input box at top of File Tree panel
- Search button and Clear button
- Enter key support for quick search
- Search query preserved in input field
2. Search API
- Route: /api/v2/tree/:user_id/search?q=keyword&mode=tree
- Searches: label, aliases_json, file_uuid, sha256
- Case-insensitive search (LOWER LIKE %keyword%)
- Returns matching nodes in selected display mode
3. Search Logic
- SQL: LOWER(label) LIKE ? OR LOWER(aliases_json) LIKE ? ...
- Preserves parent_id and children relationships
- Compatible with all display modes (tree, list, grid)
Test result:
- Query: 'download' → 22 matches ✅
- Query: 'jpg' → 593 matches (jpg files)
- Query: 'mp4' → 56 matches (video files)
UI workflow:
1. File Tree → Login
2. Enter search keyword in search box
3. Press Enter or click Search button
4. Matching files/folders displayed
5. Click Clear to reset view
Files:
- src/page.html (search UI, searchTree/clearSearch functions)
- src/server.rs (search_tree API handler)
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