feat: add custom NOTICE log level between INFO and WARN

- Add NoticeLevel constant using zapcore.WarnLevel value (1)
- Implement custom level encoders (noticeLevelEncoder, noticeColorLevelEncoder)
- Update Notice() method to use custom level
- Add "notice" case to log level parsing in main.go
- Update encoder configurations to handle NOTICE level properly
- Add comprehensive test (TestNoticeLevel) to verify behavior

The NOTICE level provides visual distinction from INFO and ERROR levels,
with cyan color in development and proper level filtering. When log level
is set to NOTICE, it shows NOTICE and above (WARN, ERROR) while filtering
out DEBUG and INFO messages.

Note: NOTICE and WARN share the same numeric value (1) due to zap's
integer-based level system, so both display as "NOTICE" in logs for
visual consistency.

Usage:
- logger.Notice().Msg("message")
- log_level = "notice" in config
- Supports structured logging with fields

cmd/cli/main.go

@@ -83,19 +83,18 @@ func normalizeLogFilePath(logFilePath string) string {
 
 // initConsoleLogging initializes console logging, then storing to mainLog.
 func initConsoleLogging() {
-	consoleWriterLevel = zapcore.InfoLevel
+	consoleWriterLevel = ctrld.NoticeLevel
 	switch {
 	case silent:
 		// For silent mode, use a no-op logger
 		l := zap.NewNop()
 		mainLog.Store(&ctrld.Logger{Logger: l})
 	case verbose == 1:
-		// Info level is default
+		// Info level
+		consoleWriterLevel = zapcore.InfoLevel
 	case verbose > 1:
 		// Debug level
 		consoleWriterLevel = zapcore.DebugLevel
-	default:
-		// Notice level maps to Info in zap
 	}
 	consoleWriter = newHumanReadableZapCore(os.Stdout, consoleWriterLevel)
 	l := zap.New(consoleWriter)
@@ -172,6 +171,8 @@ func initLoggingWithBackup(doBackup bool) []zapcore.Core {
 		level = zapcore.DebugLevel
 	case "info":
 		level = zapcore.InfoLevel
+	case "notice":
+		level = ctrld.NoticeLevel
 	case "warn":
 		level = zapcore.WarnLevel
 	case "error":