feat: 添加种子数据初始化功能，重构多个处理程序以简化错误响应和用户验证

internal/repository/texture_repository.go

@@ -2,63 +2,44 @@ package repository
 
 import (
 	"carrotskin/internal/model"
-	"carrotskin/pkg/database"
+
 	"gorm.io/gorm"
 )
 
 // CreateTexture 创建材质
 func CreateTexture(texture *model.Texture) error {
-	db := database.MustGetDB()
-	return db.Create(texture).Error
+	return getDB().Create(texture).Error
 }
 
 // FindTextureByID 根据ID查找材质
 func FindTextureByID(id int64) (*model.Texture, error) {
-	db := database.MustGetDB()
 	var texture model.Texture
-	err := db.Preload("Uploader").First(&texture, id).Error
-	if err != nil {
-		if err == gorm.ErrRecordNotFound {
-			return nil, nil
-		}
-		return nil, err
-	}
-	return &texture, nil
+	err := getDB().Preload("Uploader").First(&texture, id).Error
+	return HandleNotFound(&texture, err)
 }
 
 // FindTextureByHash 根据Hash查找材质
 func FindTextureByHash(hash string) (*model.Texture, error) {
-	db := database.MustGetDB()
 	var texture model.Texture
-	err := db.Where("hash = ?", hash).First(&texture).Error
-	if err != nil {
-		if err == gorm.ErrRecordNotFound {
-			return nil, nil
-		}
-		return nil, err
-	}
-	return &texture, nil
+	err := getDB().Where("hash = ?", hash).First(&texture).Error
+	return HandleNotFound(&texture, err)
 }
 
 // FindTexturesByUploaderID 根据上传者ID查找材质列表
 func FindTexturesByUploaderID(uploaderID int64, page, pageSize int) ([]*model.Texture, int64, error) {
-	db := database.MustGetDB()
+	db := getDB()
 	var textures []*model.Texture
 	var total int64
 
 	query := db.Model(&model.Texture{}).Where("uploader_id = ? AND status != -1", uploaderID)
 
-	// 获取总数
 	if err := query.Count(&total).Error; err != nil {
 		return nil, 0, err
 	}
 
-	// 分页查询
-	offset := (page - 1) * pageSize
-	err := query.Preload("Uploader").
+	err := query.Scopes(Paginate(page, pageSize)).
+		Preload("Uploader").
 		Order("created_at DESC").
-		Offset(offset).
-		Limit(pageSize).
 		Find(&textures).Error
 
 	if err != nil {
@@ -70,38 +51,29 @@ func FindTexturesByUploaderID(uploaderID int64, page, pageSize int) ([]*model.Te
 
 // SearchTextures 搜索材质
 func SearchTextures(keyword string, textureType model.TextureType, publicOnly bool, page, pageSize int) ([]*model.Texture, int64, error) {
-	db := database.MustGetDB()
+	db := getDB()
 	var textures []*model.Texture
 	var total int64
 
 	query := db.Model(&model.Texture{}).Where("status = 1")
 
-	// 公开筛选
 	if publicOnly {
 		query = query.Where("is_public = ?", true)
 	}
-
-	// 类型筛选
 	if textureType != "" {
 		query = query.Where("type = ?", textureType)
 	}
-
-	// 关键词搜索
 	if keyword != "" {
 		query = query.Where("name LIKE ? OR description LIKE ?", "%"+keyword+"%", "%"+keyword+"%")
 	}
 
-	// 获取总数
 	if err := query.Count(&total).Error; err != nil {
 		return nil, 0, err
 	}
 
-	// 分页查询
-	offset := (page - 1) * pageSize
-	err := query.Preload("Uploader").
+	err := query.Scopes(Paginate(page, pageSize)).
+		Preload("Uploader").
 		Order("created_at DESC").
-		Offset(offset).
-		Limit(pageSize).
 		Find(&textures).Error
 
 	if err != nil {
@@ -113,86 +85,72 @@ func SearchTextures(keyword string, textureType model.TextureType, publicOnly bo
 
 // UpdateTexture 更新材质
 func UpdateTexture(texture *model.Texture) error {
-	db := database.MustGetDB()
-	return db.Save(texture).Error
+	return getDB().Save(texture).Error
 }
 
 // UpdateTextureFields 更新材质指定字段
 func UpdateTextureFields(id int64, fields map[string]interface{}) error {
-	db := database.MustGetDB()
-	return db.Model(&model.Texture{}).Where("id = ?", id).Updates(fields).Error
+	return getDB().Model(&model.Texture{}).Where("id = ?", id).Updates(fields).Error
 }
 
 // DeleteTexture 删除材质（软删除）
 func DeleteTexture(id int64) error {
-	db := database.MustGetDB()
-	return db.Model(&model.Texture{}).Where("id = ?", id).Update("status", -1).Error
+	return getDB().Model(&model.Texture{}).Where("id = ?", id).Update("status", -1).Error
 }
 
 // IncrementTextureDownloadCount 增加下载次数
 func IncrementTextureDownloadCount(id int64) error {
-	db := database.MustGetDB()
-	return db.Model(&model.Texture{}).Where("id = ?", id).
+	return getDB().Model(&model.Texture{}).Where("id = ?", id).
 		UpdateColumn("download_count", gorm.Expr("download_count + ?", 1)).Error
 }
 
 // IncrementTextureFavoriteCount 增加收藏次数
 func IncrementTextureFavoriteCount(id int64) error {
-	db := database.MustGetDB()
-	return db.Model(&model.Texture{}).Where("id = ?", id).
+	return getDB().Model(&model.Texture{}).Where("id = ?", id).
 		UpdateColumn("favorite_count", gorm.Expr("favorite_count + ?", 1)).Error
 }
 
 // DecrementTextureFavoriteCount 减少收藏次数
 func DecrementTextureFavoriteCount(id int64) error {
-	db := database.MustGetDB()
-	return db.Model(&model.Texture{}).Where("id = ?", id).
+	return getDB().Model(&model.Texture{}).Where("id = ?", id).
 		UpdateColumn("favorite_count", gorm.Expr("favorite_count - ?", 1)).Error
 }
 
 // CreateTextureDownloadLog 创建下载日志
 func CreateTextureDownloadLog(log *model.TextureDownloadLog) error {
-	db := database.MustGetDB()
-	return db.Create(log).Error
+	return getDB().Create(log).Error
 }
 
 // IsTextureFavorited 检查是否已收藏
 func IsTextureFavorited(userID, textureID int64) (bool, error) {
-	db := database.MustGetDB()
 	var count int64
-	err := db.Model(&model.UserTextureFavorite{}).
+	err := getDB().Model(&model.UserTextureFavorite{}).
 		Where("user_id = ? AND texture_id = ?", userID, textureID).
 		Count(&count).Error
-	if err != nil {
-		return false, err
-	}
-	return count > 0, nil
+	return count > 0, err
 }
 
 // AddTextureFavorite 添加收藏
 func AddTextureFavorite(userID, textureID int64) error {
-	db := database.MustGetDB()
 	favorite := &model.UserTextureFavorite{
 		UserID:    userID,
 		TextureID: textureID,
 	}
-	return db.Create(favorite).Error
+	return getDB().Create(favorite).Error
 }
 
 // RemoveTextureFavorite 取消收藏
 func RemoveTextureFavorite(userID, textureID int64) error {
-	db := database.MustGetDB()
-	return db.Where("user_id = ? AND texture_id = ?", userID, textureID).
+	return getDB().Where("user_id = ? AND texture_id = ?", userID, textureID).
 		Delete(&model.UserTextureFavorite{}).Error
 }
 
 // GetUserTextureFavorites 获取用户收藏的材质列表
 func GetUserTextureFavorites(userID int64, page, pageSize int) ([]*model.Texture, int64, error) {
-	db := database.MustGetDB()
+	db := getDB()
 	var textures []*model.Texture
 	var total int64
 
-	// 子查询获取收藏的材质ID
 	subQuery := db.Model(&model.UserTextureFavorite{}).
 		Select("texture_id").
 		Where("user_id = ?", userID)
@@ -200,17 +158,13 @@ func GetUserTextureFavorites(userID int64, page, pageSize int) ([]*model.Texture
 	query := db.Model(&model.Texture{}).
 		Where("id IN (?) AND status = 1", subQuery)
 
-	// 获取总数
 	if err := query.Count(&total).Error; err != nil {
 		return nil, 0, err
 	}
 
-	// 分页查询
-	offset := (page - 1) * pageSize
-	err := query.Preload("Uploader").
+	err := query.Scopes(Paginate(page, pageSize)).
+		Preload("Uploader").
 		Order("created_at DESC").
-		Offset(offset).
-		Limit(pageSize).
 		Find(&textures).Error
 
 	if err != nil {
@@ -222,9 +176,8 @@ func GetUserTextureFavorites(userID int64, page, pageSize int) ([]*model.Texture
 
 // CountTexturesByUploaderID 统计用户上传的材质数量
 func CountTexturesByUploaderID(uploaderID int64) (int64, error) {
-	db := database.MustGetDB()
 	var count int64
-	err := db.Model(&model.Texture{}).
+	err := getDB().Model(&model.Texture{}).
 		Where("uploader_id = ? AND status != -1", uploaderID).
 		Count(&count).Error
 	return count, err