Implement Share Management UI (Phase 11 P0 #2)
Share Management Features:
- Shares.vue: Complete share CRUD interface
- Tauri commands: 5 share endpoints
- In-memory share storage (lazy_static)
UI Components:
- Share list table (name, path, protocol, users, permissions)
- Create share dialog (name, path, protocol, users, permissions)
- Edit share dialog (path, protocol, users, permissions)
- Delete share confirmation
- Test connection button
Tauri Commands:
- list_shares: List all shares
- create_share: Create share + create directory if needed
- update_share: Update share config
- delete_share: Remove share from list
- test_share_connection: Test share path exists
Supported Protocols:
- SMB/CIFS (default)
- SFTP
- WebDAV
- S3
Router:
- Added /shares route
Home.vue:
- Added Share Management card
Build: ✅ Tauri + markbase-core
Tests: 495 markbase-core + 201 smb-server
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