Add four new server statistics widgets:
- SystemWidget: displays hostname, OS, and kernel information
- UptimeWidget: shows server total uptime with formatted display
- NetworkWidget: lists network interfaces with IP and status
- ProcessesWidget: displays top processes by CPU usage
Backend changes:
- Extended SSH metrics collection to gather network, uptime, process, and system data
- Added commands to parse /proc/uptime, ip addr, ps aux output
Frontend changes:
- Created 4 new widget components with consistent styling
- Updated widget type definitions and HostManagerEditor
- Unified all widget heights to 280px for consistent layout
- Added translations for all new widgets (EN/ZH)
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Co-Authored-By: Claude <noreply@anthropic.com>