fix: optimize report command to avoid creating timestamp directories

- Implement lazy loading for directory creation in config.go
- Add logFile parameter to InitLogger for better control
- Use dynamic directory existence check instead of flags
- Report command now uses console-only logging to prevent directory creation
- Support both JSON and colorized console output formats
- Maintain backward compatibility for all other commands

Changes:
- config.go: Convert directory paths to getter methods with lazy creation
- logger.go: Add logFile parameter and improve logging control
- cmd/root.go: Detect report command and disable file logging
- uixt/*: Update all references to use new getter methods

Fixes the issue where 'hrp report results/' would create unwanted timestamp directories

cmd/root.go

@@ -46,7 +46,9 @@ GitHub: https://github.com/httprunner/httprunner
 
 Copyright © 2017-present debugtalk. Apache-2.0 License.`,
 	PersistentPreRun: func(cmd *cobra.Command, args []string) {
-		hrp.InitLogger(logLevel, logJSON)
+		// For report command, don't create log files to avoid creating directories
+		enableLogFile := cmd.Name() != "report"
+		hrp.InitLogger(logLevel, logJSON, enableLogFile)
 	},
 	Version:          version.GetVersionInfo(),
 	TraverseChildren: true, // parses flags on all parents before executing child command