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/user_repository.go

@@ -7,60 +7,60 @@ import (
 	"gorm.io/gorm"
 )
 
-// CreateUser 创建用户
-func CreateUser(user *model.User) error {
-	return getDB().Create(user).Error
+// userRepository UserRepository的实现
+type userRepository struct {
+	db *gorm.DB
 }
 
-// FindUserByID 根据ID查找用户
-func FindUserByID(id int64) (*model.User, error) {
+// NewUserRepository 创建UserRepository实例
+func NewUserRepository(db *gorm.DB) UserRepository {
+	return &userRepository{db: db}
+}
+
+func (r *userRepository) Create(user *model.User) error {
+	return r.db.Create(user).Error
+}
+
+func (r *userRepository) FindByID(id int64) (*model.User, error) {
 	var user model.User
-	err := getDB().Where("id = ? AND status != -1", id).First(&user).Error
-	return HandleNotFound(&user, err)
+	err := r.db.Where("id = ? AND status != -1", id).First(&user).Error
+	return handleNotFoundResult(&user, err)
 }
 
-// FindUserByUsername 根据用户名查找用户
-func FindUserByUsername(username string) (*model.User, error) {
+func (r *userRepository) FindByUsername(username string) (*model.User, error) {
 	var user model.User
-	err := getDB().Where("username = ? AND status != -1", username).First(&user).Error
-	return HandleNotFound(&user, err)
+	err := r.db.Where("username = ? AND status != -1", username).First(&user).Error
+	return handleNotFoundResult(&user, err)
 }
 
-// FindUserByEmail 根据邮箱查找用户
-func FindUserByEmail(email string) (*model.User, error) {
+func (r *userRepository) FindByEmail(email string) (*model.User, error) {
 	var user model.User
-	err := getDB().Where("email = ? AND status != -1", email).First(&user).Error
-	return HandleNotFound(&user, err)
+	err := r.db.Where("email = ? AND status != -1", email).First(&user).Error
+	return handleNotFoundResult(&user, err)
 }
 
-// UpdateUser 更新用户
-func UpdateUser(user *model.User) error {
-	return getDB().Save(user).Error
+func (r *userRepository) Update(user *model.User) error {
+	return r.db.Save(user).Error
 }
 
-// UpdateUserFields 更新指定字段
-func UpdateUserFields(id int64, fields map[string]interface{}) error {
-	return getDB().Model(&model.User{}).Where("id = ?", id).Updates(fields).Error
+func (r *userRepository) UpdateFields(id int64, fields map[string]interface{}) error {
+	return r.db.Model(&model.User{}).Where("id = ?", id).Updates(fields).Error
 }
 
-// DeleteUser 软删除用户
-func DeleteUser(id int64) error {
-	return getDB().Model(&model.User{}).Where("id = ?", id).Update("status", -1).Error
+func (r *userRepository) Delete(id int64) error {
+	return r.db.Model(&model.User{}).Where("id = ?", id).Update("status", -1).Error
 }
 
-// CreateLoginLog 创建登录日志
-func CreateLoginLog(log *model.UserLoginLog) error {
-	return getDB().Create(log).Error
+func (r *userRepository) CreateLoginLog(log *model.UserLoginLog) error {
+	return r.db.Create(log).Error
 }
 
-// CreatePointLog 创建积分日志
-func CreatePointLog(log *model.UserPointLog) error {
-	return getDB().Create(log).Error
+func (r *userRepository) CreatePointLog(log *model.UserPointLog) error {
+	return r.db.Create(log).Error
 }
 
-// UpdateUserPoints 更新用户积分（事务）
-func UpdateUserPoints(userID int64, amount int, changeType, reason string) error {
-	return getDB().Transaction(func(tx *gorm.DB) error {
+func (r *userRepository) UpdatePoints(userID int64, amount int, changeType, reason string) error {
+	return r.db.Transaction(func(tx *gorm.DB) error {
 		var user model.User
 		if err := tx.Where("id = ?", userID).First(&user).Error; err != nil {
 			return err
@@ -90,12 +90,13 @@ func UpdateUserPoints(userID int64, amount int, changeType, reason string) error
 	})
 }
 
-// UpdateUserAvatar 更新用户头像
-func UpdateUserAvatar(userID int64, avatarURL string) error {
-	return getDB().Model(&model.User{}).Where("id = ?", userID).Update("avatar", avatarURL).Error
-}
-
-// UpdateUserEmail 更新用户邮箱
-func UpdateUserEmail(userID int64, email string) error {
-	return getDB().Model(&model.User{}).Where("id = ?", userID).Update("email", email).Error
+// handleNotFoundResult 处理记录未找到的情况
+func handleNotFoundResult[T any](result *T, err error) (*T, error) {
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	return result, nil
 }