feat: add Whatsapp embedded signup API

db/migrate/20250526000001_add_channel_attributes_to_inboxes.rb

@@ -0,0 +1,5 @@
+class AddChannelAttributesToInboxes < ActiveRecord::Migration[7.0]
+  def change
+    add_column :inboxes, :channel_attributes, :jsonb, default: {}
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2025_05_14_045638) do
+ActiveRecord::Schema[7.0].define(version: 2025_05_26_000001) do
   # These extensions should be enabled to support this database
   enable_extension "pg_stat_statements"
   enable_extension "pg_trgm"
@@ -730,6 +730,7 @@ ActiveRecord::Schema[7.0].define(version: 2025_05_14_045638) do
     t.integer "sender_name_type", default: 0, null: false
     t.string "business_name"
     t.jsonb "csat_config", default: {}, null: false
+    t.jsonb "channel_attributes", default: {}
     t.index ["account_id"], name: "index_inboxes_on_account_id"
     t.index ["channel_id", "channel_type"], name: "index_inboxes_on_channel_id_and_channel_type"
     t.index ["portal_id"], name: "index_inboxes_on_portal_id"