chore: Add Contact Note APIs (#3266)

app/models/note.rb

@@ -23,6 +23,7 @@
 #  fk_rails_...  (user_id => users.id)
 #
 class Note < ApplicationRecord
+  before_validation :ensure_account_id
   validates :content, presence: true
   validates :account_id, presence: true
   validates :contact_id, presence: true
@@ -31,4 +32,10 @@ class Note < ApplicationRecord
   belongs_to :account
   belongs_to :contact
   belongs_to :user
+
+  private
+
+  def ensure_account_id
+    self.account_id = contact&.account_id
+  end
 end