feat(user): implement OTP login, user creation, and profile management

- Added SendOTP method for simulating OTP sending.
- Implemented LoginWithOTP method for user login/registration via OTP, including user creation if not found.
- Added Me method to retrieve current user information.
- Implemented Update method for updating user profile details.
- Added RealName method for real-name verification.
- Implemented GetNotifications method to fetch user notifications.
- Created user_test.go for comprehensive unit tests covering login, profile retrieval, updates, real-name verification, and notifications.
- Updated database models to use appropriate consts for fields like gender, status, and roles.

backend/database/models/contents.query.gen.go

@@ -30,8 +30,8 @@ func newContent(db *gorm.DB, opts ...gen.DOOption) contentQuery {
 	_contentQuery.UserID = field.NewInt64(tableName, "user_id")
 	_contentQuery.Title = field.NewString(tableName, "title")
 	_contentQuery.Description = field.NewString(tableName, "description")
-	_contentQuery.Status = field.NewString(tableName, "status")
-	_contentQuery.Visibility = field.NewString(tableName, "visibility")
+	_contentQuery.Status = field.NewField(tableName, "status")
+	_contentQuery.Visibility = field.NewField(tableName, "visibility")
 	_contentQuery.PreviewSeconds = field.NewInt32(tableName, "preview_seconds")
 	_contentQuery.PreviewDownloadable = field.NewBool(tableName, "preview_downloadable")
 	_contentQuery.PublishedAt = field.NewTime(tableName, "published_at")
@@ -59,8 +59,8 @@ type contentQuery struct {
 	UserID              field.Int64
 	Title               field.String
 	Description         field.String
-	Status              field.String
-	Visibility          field.String
+	Status              field.Field
+	Visibility          field.Field
 	PreviewSeconds      field.Int32
 	PreviewDownloadable field.Bool
 	PublishedAt         field.Time
@@ -94,8 +94,8 @@ func (c *contentQuery) updateTableName(table string) *contentQuery {
 	c.UserID = field.NewInt64(table, "user_id")
 	c.Title = field.NewString(table, "title")
 	c.Description = field.NewString(table, "description")
-	c.Status = field.NewString(table, "status")
-	c.Visibility = field.NewString(table, "visibility")
+	c.Status = field.NewField(table, "status")
+	c.Visibility = field.NewField(table, "visibility")
 	c.PreviewSeconds = field.NewInt32(table, "preview_seconds")
 	c.PreviewDownloadable = field.NewBool(table, "preview_downloadable")
 	c.PublishedAt = field.NewTime(table, "published_at")