SystemMonitor: CPU RAM Battery

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- All-new telemetry UI: dark theme, monospaced readouts, device spec header
- NEW Device Health Report: hardware rating from real specs
- NEW offline Calendar: 2026-2027 holidays, make-up workdays, lunar festivals
- NEW Stability Stress Test: temperature and frequency under full load
- NEW History Trends: 1/6/24-hour CPU, memory, temperature charts, CSV export
- NEW App Risk Scan, network speed test, monthly data ranking
- NEW Alert Guard, 3 widgets, 7 languages, updated privacy policy