Aggiunge traduzioni it/en/fr/de/es agli avvisi e toglie gli override Android/iOS.

Un avviso ha un testo per lingua; per differenziare le piattaforme si creano due avvisi. L'app riceve già il copy risolto da Accept-Language.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/db/migrate/20260820190000_add_announcement_translations.rb

@@ -0,0 +1,5 @@
+class AddAnnouncementTranslations < ActiveRecord::Migration[7.2]
+  def change
+    add_column :app_announcements, :translations, :jsonb, null: false, default: {}
+  end
+end

backend/db/migrate/20260820191000_remove_announcement_platform_copy.rb

@@ -0,0 +1,12 @@
+class RemoveAnnouncementPlatformCopy < ActiveRecord::Migration[7.2]
+  def change
+    remove_column :app_announcements, :android_title, :string
+    remove_column :app_announcements, :android_body, :text
+    remove_column :app_announcements, :android_action_url, :string
+    remove_column :app_announcements, :android_action_label, :string
+    remove_column :app_announcements, :ios_title, :string
+    remove_column :app_announcements, :ios_body, :text
+    remove_column :app_announcements, :ios_action_url, :string
+    remove_column :app_announcements, :ios_action_label, :string
+  end
+end

backend/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.2].define(version: 2026_08_20_180000) do
+ActiveRecord::Schema[7.2].define(version: 2026_08_20_191000) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
   enable_extension "plpgsql"
@@ -69,14 +69,7 @@ ActiveRecord::Schema[7.2].define(version: 2026_08_20_180000) do
     t.datetime "updated_at", null: false
     t.boolean "show_on_android", default: true, null: false
     t.boolean "show_on_ios", default: true, null: false
-    t.string "android_title"
-    t.text "android_body"
-    t.string "android_action_url"
-    t.string "android_action_label"
-    t.string "ios_title"
-    t.text "ios_body"
-    t.string "ios_action_url"
-    t.string "ios_action_label"
+    t.jsonb "translations", default: {}, null: false
     t.index ["created_by_admin_id"], name: "index_app_announcements_on_created_by_admin_id"
     t.index ["status", "starts_at", "ends_at"], name: "index_app_announcements_on_status_and_starts_at_and_ends_at"
     t.index ["status"], name: "index_app_announcements_on_status"