chore: Enable flexible whatsapp onboarding (Manual + Embedded Signup) options (#12344)

We recently introduced the WhatsApp Embedded Signup flow in Chatwoot to
simplify onboarding. However, we discovered two important limitations:
Some customers’ numbers are already linked to an Embedded Signup, which
blocks re-use. Tech providers cannot onboard their own numbers via
Embedded Signup.
As a result, we need to support both Manual and Embedded Signup flows to
cover all scenarios.

### Problem

- Current UI only offers the Embedded Signup option.
- Customers who need to reuse existing numbers (already connected to
WABA) or tech providers testing their own numbers get stuck.
- Manual flow exists but is no longer exposed in the UX

**Current Embedded Signup screen**
<img width="2564" height="1250" alt="CleanShot 2025-08-21 at 21 58
07@2x"
src="https://github.com/user-attachments/assets/c3de4cf1-cae6-4a0e-aa9c-5fa4e2249c0e"
/>

**Current Manual Setup screen**
<img width="2568" height="1422" alt="CleanShot 2025-08-21 at 22 00
25@2x"
src="https://github.com/user-attachments/assets/96408f97-3ffe-42d1-9019-a511e808f5ac"
/>


###  Solution

- Design a dual-path UX in the Create WhatsApp Inbox step that:
- Offers Embedded Signup (default/recommended) for new numbers and
businesses.
- Offers Manual Setup for advanced users, existing linked numbers, and
tech providers.

<img width="2030" height="1376" alt="CleanShot 2025-09-01 at 14 13
16@2x"
src="https://github.com/user-attachments/assets/6f17e5a2-a2fd-40fb-826a-c9ee778be795"
/>

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>

spec/controllers/api/v1/accounts/whatsapp/authorizations_controller_spec.rb

@@ -16,31 +16,7 @@ RSpec.describe 'WhatsApp Authorization API', type: :request do
       let(:agent) { create(:user, account: account, role: :agent) }
       let(:administrator) { create(:user, account: account, role: :administrator) }
 
-      context 'when feature is not enabled' do
-        before do
-          account.disable_features!(:whatsapp_embedded_signup)
-        end
-
-        it 'returns forbidden' do
-          post "/api/v1/accounts/#{account.id}/whatsapp/authorization",
-               params: {
-                 code: 'test_code',
-                 business_id: 'test_business_id',
-                 waba_id: 'test_waba_id'
-               },
-               headers: agent.create_new_auth_token,
-               as: :json
-
-          expect(response).to have_http_status(:forbidden)
-          expect(response.parsed_body['error']).to eq('WhatsApp embedded signup is not enabled for this account')
-        end
-      end
-
-      context 'when feature is enabled' do
-        before do
-          account.enable_features!(:whatsapp_embedded_signup)
-        end
-
+      context 'when authenticated user makes request' do
         it 'returns unprocessable entity when code is missing' do
           post "/api/v1/accounts/#{account.id}/whatsapp/authorization",
                params: {
@@ -246,10 +222,6 @@ RSpec.describe 'WhatsApp Authorization API', type: :request do
       context 'when user is not authorized for the account' do
         let(:other_account) { create(:account) }
 
-        before do
-          account.enable_features!(:whatsapp_embedded_signup)
-        end
-
         it 'returns unauthorized' do
           post "/api/v1/accounts/#{other_account.id}/whatsapp/authorization",
                params: {
@@ -265,10 +237,6 @@ RSpec.describe 'WhatsApp Authorization API', type: :request do
       end
 
       context 'when user is an administrator' do
-        before do
-          account.enable_features!(:whatsapp_embedded_signup)
-        end
-
         it 'allows channel creation' do
           embedded_signup_service = instance_double(Whatsapp::EmbeddedSignupService)
           whatsapp_channel = create(:channel_whatsapp, account: account, validate_provider_config: false, sync_templates: false)
@@ -321,10 +289,6 @@ RSpec.describe 'WhatsApp Authorization API', type: :request do
     context 'when user is an administrator' do
       let(:administrator) { create(:user, account: account, role: :administrator) }
 
-      before do
-        account.enable_features!(:whatsapp_embedded_signup)
-      end
-
       context 'with valid parameters' do
         let(:valid_params) do
           {
@@ -489,7 +453,6 @@ RSpec.describe 'WhatsApp Authorization API', type: :request do
       let(:agent) { create(:user, account: account, role: :agent) }
 
       before do
-        account.enable_features!(:whatsapp_embedded_signup)
         create(:inbox_member, inbox: whatsapp_inbox, user: agent)
       end