feat(inboxes): add app store reviews channel

db/migrate/20260520090000_create_channel_app_store.rb

@@ -0,0 +1,19 @@
+class CreateChannelAppStore < ActiveRecord::Migration[7.1]
+  def change
+    create_table :channel_app_store do |t|
+      t.bigint :account_id, null: false
+      t.string :app_id, null: false
+      t.string :bundle_id
+      t.string :app_name
+      t.string :issuer_id, null: false
+      t.string :key_id, null: false
+      t.text :private_key, null: false
+      t.jsonb :provider_config, null: false, default: {}
+      t.datetime :last_synced_at
+
+      t.timestamps
+    end
+
+    add_index :channel_app_store, [:account_id, :app_id], unique: true
+  end
+end