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/runtime.go

@@ -4,6 +4,7 @@ package models
 
 import (
 	"juwan-backend/app/users/rpc/internal/models/schema"
+	"juwan-backend/app/users/rpc/internal/models/userfollows"
 	"juwan-backend/app/users/rpc/internal/models/userpreferences"
 	"juwan-backend/app/users/rpc/internal/models/users"
 	"time"
@@ -13,6 +14,10 @@ import (
 // (default values, validators, hooks and policies) and stitches it
 // to their package variables.
 func init() {
+	userfollowsFields := schema.UserFollows{}.Fields()
+	_ = userfollowsFields
+	userfollowsDescCreatedAt := userfollowsFields[3].Descriptor()
+	userfollows.DefaultCreatedAt = userfollowsDescCreatedAt.Default.(func() time.Time)
 	userpreferencesFields := schema.UserPreferences{}.Fields()
 	_ = userpreferencesFields
 	// userpreferencesDescNotificationOrder is the schema descriptor for notification_order field.