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/system_config_repository.go

@@ -2,35 +2,42 @@ package repository
 
 import (
 	"carrotskin/internal/model"
+
+	"gorm.io/gorm"
 )
 
-// GetSystemConfigByKey 根据键获取配置
-func GetSystemConfigByKey(key string) (*model.SystemConfig, error) {
+// systemConfigRepository SystemConfigRepository的实现
+type systemConfigRepository struct {
+	db *gorm.DB
+}
+
+// NewSystemConfigRepository 创建SystemConfigRepository实例
+func NewSystemConfigRepository(db *gorm.DB) SystemConfigRepository {
+	return &systemConfigRepository{db: db}
+}
+
+func (r *systemConfigRepository) GetByKey(key string) (*model.SystemConfig, error) {
 	var config model.SystemConfig
-	err := getDB().Where("key = ?", key).First(&config).Error
-	return HandleNotFound(&config, err)
+	err := r.db.Where("key = ?", key).First(&config).Error
+	return handleNotFoundResult(&config, err)
 }
 
-// GetPublicSystemConfigs 获取所有公开配置
-func GetPublicSystemConfigs() ([]model.SystemConfig, error) {
+func (r *systemConfigRepository) GetPublic() ([]model.SystemConfig, error) {
 	var configs []model.SystemConfig
-	err := getDB().Where("is_public = ?", true).Find(&configs).Error
+	err := r.db.Where("is_public = ?", true).Find(&configs).Error
 	return configs, err
 }
 
-// GetAllSystemConfigs 获取所有配置（管理员用）
-func GetAllSystemConfigs() ([]model.SystemConfig, error) {
+func (r *systemConfigRepository) GetAll() ([]model.SystemConfig, error) {
 	var configs []model.SystemConfig
-	err := getDB().Find(&configs).Error
+	err := r.db.Find(&configs).Error
 	return configs, err
 }
 
-// UpdateSystemConfig 更新配置
-func UpdateSystemConfig(config *model.SystemConfig) error {
-	return getDB().Save(config).Error
+func (r *systemConfigRepository) Update(config *model.SystemConfig) error {
+	return r.db.Save(config).Error
 }
 
-// UpdateSystemConfigValue 更新配置值
-func UpdateSystemConfigValue(key, value string) error {
-	return getDB().Model(&model.SystemConfig{}).Where("key = ?", key).Update("value", value).Error
+func (r *systemConfigRepository) UpdateValue(key, value string) error {
+	return r.db.Model(&model.SystemConfig{}).Where("key = ?", key).Update("value", value).Error
 }