refactor(report): update import paths and enhance logging functionality

- Removed unused time imports from report DTO and service files.
- Updated import paths for response handling in admin and general report handlers.
- Refactored logging methods in admin and report services to use a unified operation logging approach.
- Introduced helper functions for extracting text from message segments and converting user models to brief report information.

internal/dto/report.go

@@ -2,7 +2,6 @@ package dto
 
 import (
 	"carrot_bbs/internal/model"
-	"time"
 )
 
 // ==================== 举报 DTOs ====================