integration of the new MVC for subproject_addresses

db/migrate/20250722152542_create_subproject_addresses.rb

@@ -0,0 +1,13 @@
+class CreateSubprojectAddresses < ActiveRecord::Migration[8.0]
+  def change
+    create_table :subproject_addresses do |t|
+      t.string :streetname
+      t.string :zipcode
+      t.string :city
+      t.string :country
+      t.text :notes
+
+      t.timestamps
+    end
+  end
+end