新增：专家入驻状态

app/models/user.rb

@@ -196,6 +196,7 @@ class User < Owner
   has_many :user_vote_options, dependent: :destroy 
   has_many :vote_options, through: :user_vote_options
   has_many :memos, foreign_key: :author_id, dependent: :destroy
+  has_one :resident_expert, dependent: :destroy
   
   # Groups and active users
   scope :active, lambda { where(status: [STATUS_ACTIVE, STATUS_EDIT_INFO]) }