Add multi-destination logging: syslog and file support

Implement logging infrastructure for non-systemd platforms:

- Add src/logging.rs with syslog and file logging support
- New CLI flags: --syslog, --log-file, --log-file-daily
- Syslog uses libc directly with LOG_DAEMON facility
- File logging via tracing-appender with optional daily rotation

Update service scripts:
- OpenRC and FreeBSD rc.d now use --syslog by default
- Ensures logs are captured on platforms without journald

Default (stderr) behavior unchanged for systemd compatibility.
Log destination is selected at startup based on CLI flags.

Signed-off-by: Vladimir Krivopalov <argenet@yandex.ru>

src/main.rs

@@ -8,6 +8,7 @@ mod crypto;
 mod daemon;
 mod error;
 mod ip_tracker;
+mod logging;
 mod service;
 #[cfg(test)]
 #[path = "tests/ip_tracker_hotpath_adversarial_tests.rs"]