feat: host groups - tree view with folders, drag-free context menu
Data model:
- hosts.json upgraded to {groups: [...], hosts: [...]}, auto-migrates
old flat-list format on load
- each host gets group field (default '' = ungrouped)
Manager API (core/manager.py):
- add_group / remove_group / rename_group / move_host_to_group
- list_groups / list_hosts_by_group
UI (ui/main_window.py):
- QListWidget replaced with QTreeWidget (folder tree)
- Group nodes: 📁 name (count), expandable/collapsible
- Ungrouped always shown as 📭 未分组
- Right-click context menu:
- Empty area / group: New group, Rename, Delete
- Host: Connect, Edit, Delete, Move to group (submenu)
- Double-click host = connect, double-click group = expand/collapse
- All 6 test suites pass
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