Follow call on locked account creates follow request instead

Reflect "requested" relationship in API and UI
Reflect inability of private posts to be reblogged in the UI
Disable Webfinger for locked accounts

app/models/follow_request.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class FollowRequest < ApplicationRecord
+  belongs_to :account
+  belongs_to :target_account, class_name: 'Account'
+
+  validates :account, :target_account, presence: true
+  validates :account_id, uniqueness: { scope: :target_account_id }
+
+  def authorize!
+    account.follow!(target_account)
+    FeedManager.instance.merge_into_timeline(target_account, account)
+    destroy!
+  end
+
+  def reject!
+    destroy!
+  end
+end