fix: 用户信息更新返回类型与关注建表缺陷

updateMeLogic 更新后重新查询并返回 User 类型，修复 converter 转换
空响应的错误。proto_string 不再丢弃含空格的字符串。userfollows
ent schema 补上 created_at 的 Default(time.Now)。

app/users/rpc/internal/models/userfollows_create.go

@@ -51,6 +51,7 @@ func (_c *UserFollowsCreate) Mutation() *UserFollowsMutation {
 
 // Save creates the UserFollows in the database.
 func (_c *UserFollowsCreate) Save(ctx context.Context) (*UserFollows, error) {
+	_c.defaults()
 	return withHooks(ctx, _c.sqlSave, _c.mutation, _c.hooks)
 }
 
@@ -76,6 +77,13 @@ func (_c *UserFollowsCreate) ExecX(ctx context.Context) {
 	}
 }
 
+func (_c *UserFollowsCreate) defaults() {
+	if _, ok := _c.mutation.CreatedAt(); !ok {
+		v := userfollows.DefaultCreatedAt()
+		_c.mutation.SetCreatedAt(v)
+	}
+}
+
 // check runs all checks and user-defined validators on the builder.
 func (_c *UserFollowsCreate) check() error {
 	if _, ok := _c.mutation.FollowerID(); !ok {
@@ -152,6 +160,7 @@ func (_c *UserFollowsCreateBulk) Save(ctx context.Context) ([]*UserFollows, erro
 	for i := range _c.builders {
 		func(i int, root context.Context) {
 			builder := _c.builders[i]
+			builder.defaults()
 			var mut Mutator = MutateFunc(func(ctx context.Context, m Mutation) (Value, error) {
 				mutation, ok := m.(*UserFollowsMutation)
 				if !ok {