feat: Enhance dependency injection and service integration

- Updated main.go to initialize email service and include it in the dependency injection container.
- Refactored handlers to utilize context in service method calls, improving consistency and error handling.
- Introduced new service options for upload, security, and captcha services, enhancing modularity and testability.
- Removed unused repository implementations to streamline the codebase.

This commit continues the effort to improve the architecture by ensuring all services are properly injected and utilized across the application.

internal/repository/helpers.go

@@ -1,17 +1,11 @@
 package repository
 
 import (
-	"carrotskin/pkg/database"
 	"errors"
 
 	"gorm.io/gorm"
 )
 
-// getDB 获取数据库连接（内部使用）
-func getDB() *gorm.DB {
-	return database.MustGetDB()
-}
-
 // IsNotFound 检查是否为记录未找到错误
 func IsNotFound(err error) bool {
 	return errors.Is(err, gorm.ErrRecordNotFound)
@@ -79,4 +73,3 @@ func PaginatedQuery[T any](
 
 	return items, total, nil
 }
-