feat: Add WhatsApp health monitoring and self-service registration completion (#12556)

Fixes
https://linear.app/chatwoot/issue/CW-5692/whatsapp-es-numbers-stuck-in-pending-due-to-premature-registration


###  Problem  
Multiple customers reported that their WhatsApp numbers remain stuck in
**Pending** in WhatsApp Manager even after successful onboarding.

- Our system triggers a **registration call**
(`/<PHONE_NUMBER_ID>/register`) as soon as the number is OTP verified.
- In many cases, Meta hasn’t finished **display name
review/provisioning**, so the call fails with:

  ```
  code: 100, error_subcode: 2388001
  error_user_title: "Cannot Create Certificate"
error_user_msg: "Your display name could not be processed. Please edit
your display name and try again."
  ```

- This leaves the number stuck in Pending, no messaging can start until
we manually retry registration.
- Some customers have reported being stuck in this state for **7+
days**.

###  Root cause  
- We only check `code_verification_status = VERIFIED` before attempting
registration.
- We **don’t wait** for display name provisioning (`name_status` /
`platform_type`) to be complete.
- As a result, registration fails prematurely and the number never
transitions out of Pending.

### Solution  

#### 1. Health Status Monitoring  
- Build a backend service to fetch **real-time health data** from Graph
API:
  - `code_verification_status`  
  - `name_status` / `display_name_status`  
  - `platform_type`  
  - `throughput.level`  
  - `messaging_limit_tier`  
  - `quality_rating`  
- Expose health data via API
(`/api/v1/accounts/:account_id/inboxes/:id/health`).
- Display this in the UI as an **Account Health tab** with clear badges
and direct links to WhatsApp Manager.

#### 2. Smarter Registration Logic  
- Update `WebhookSetupService` to include a **dual-condition check**:  
  - Register if:  
    1. Phone is **not verified**, OR  
2. Phone is **verified but provisioning incomplete** (`platform_type =
NOT_APPLICABLE`, `throughput.level = NOT_APPLICABLE`).
- Skip registration if number is already provisioned.  
- Retry registration automatically when stuck.  
- Provide a UI banner with complete registration button so customers can
retry without manual support.

### Screenshot
<img width="2292" height="1344" alt="CleanShot 2025-09-30 at 16 01
03@2x"
src="https://github.com/user-attachments/assets/1c417d2a-b11c-475e-b092-3c5671ee59a7"
/>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/controllers/api/v1/accounts/inboxes_controller.rb

@@ -4,7 +4,8 @@ class Api::V1::Accounts::InboxesController < Api::V1::Accounts::BaseController
   before_action :fetch_agent_bot, only: [:set_agent_bot]
   before_action :validate_limit, only: [:create]
   # we are already handling the authorization in fetch inbox
-  before_action :check_authorization, except: [:show]
+  before_action :check_authorization, except: [:show, :health]
+  before_action :validate_whatsapp_cloud_channel, only: [:health]
 
   def index
     @inboxes = policy_scope(Current.account.inboxes.order_by_name.includes(:channel, { avatar_attachment: [:blob] }))
@@ -78,6 +79,14 @@ class Api::V1::Accounts::InboxesController < Api::V1::Accounts::BaseController
     render status: :internal_server_error, json: { error: e.message }
   end
 
+  def health
+    health_data = Whatsapp::HealthService.new(@inbox.channel).fetch_health_status
+    render json: health_data
+  rescue StandardError => e
+    Rails.logger.error "[INBOX HEALTH] Error fetching health data: #{e.message}"
+    render json: { error: e.message }, status: :unprocessable_entity
+  end
+
   private
 
   def fetch_inbox
@@ -89,6 +98,12 @@ class Api::V1::Accounts::InboxesController < Api::V1::Accounts::BaseController
     @agent_bot = AgentBot.find(params[:agent_bot]) if params[:agent_bot]
   end
 
+  def validate_whatsapp_cloud_channel
+    return if @inbox.channel.is_a?(Channel::Whatsapp) && @inbox.channel.provider == 'whatsapp_cloud'
+
+    render json: { error: 'Health data only available for WhatsApp Cloud API channels' }, status: :bad_request
+  end
+
   def create_channel
     return unless allowed_channel_types.include?(permitted_params[:channel][:type])