新增：邀请用户链接生成

db/migrate/20220614070028_create_project_invite_links.rb

@@ -0,0 +1,16 @@
+class CreateProjectInviteLinks < ActiveRecord::Migration[5.2]
+  def change
+    create_table :project_invite_links do |t|
+      t.references :project 
+      t.references :user 
+      t.integer :role, default: 4
+      t.boolean :is_apply, default: true 
+      t.string :sign
+      t.datetime :expired_at
+
+      t.timestamps
+    end
+
+    add_index :project_invite_links, :sign
+  end
+end

db/migrate/20220614081950_add_project_invite_link_to_applied_projects.rb

@@ -0,0 +1,6 @@
+class AddProjectInviteLinkToAppliedProjects < ActiveRecord::Migration[5.2]
+  def change
+    add_column :forge_applied_projects, :project_invite_link_id, :integer 
+    add_index :forge_applied_projects, :project_invite_link_id
+  end
+end