stswangzhiping b3770d21d4 feat: add structured logging, process watchdog, and systemd hardening ...

- Add lib/logger.js: timestamped structured logging with 5MB x 5 file rotation
- Add lib/watchdog.js: generic child process supervisor with rate-limited restarts
- Enhance client.js: WS ping/pong liveness detection, uncaughtException/unhandledRejection handlers, systemd sd-notify integration
- Refactor frpc.js: FrpcManager now delegates to Watchdog instead of manual spawn/exit
- Enhance install.sh: environment file, log directory, systemd resource limits, security hardening, WatchdogSec=60
- Replace all console.log/warn/error with structured logger across modules

Made-with: Cursor

2026-03-16 07:31:19 +08:00

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