feat: account enrichment using context.dev [UPM-27] (#13978)

## Account branding enrichment during signup

This PR does the following

### Replace Firecrawl with Context.dev

Switches the enterprise brand lookup from Firecrawl to Context.dev for
better data quality, built-in caching, and automatic filtering of
free/disposable email providers. The service interface changes from URL
to email input to match Context.dev's email endpoint. OSS still falls
back to basic HTML scraping with a normalized output shape across both
paths.

The enterprise path intentionally does not fall back to HTML scraping on
failure — speed matters more than completeness. We want the user on the
editable onboarding form fast, and a slow fallback scrape is worse than
letting them fill it in.

Requires `CONTEXT_DEV_API_KEY` in Super Admin → App Config. Without it,
falls back to OSS HTML scraping.

### Add job to enrich account details

After account creation, `Account::BrandingEnrichmentJob` looks up the
signup email and pre-fills the account name, colors, logos, social
links, and industry into `custom_attributes['brand_info']`.

The job signals completion via a short-lived Redis key (30s TTL) + an
ActionCable broadcast (`account.enrichment_completed`). The Redis key
lets the frontend distinguish "still running" from "finished with no
results."

app/controllers/api/v1/accounts_controller.rb

@@ -30,6 +30,7 @@ class Api::V1::AccountsController < Api::BaseController
       locale: account_params[:locale],
       user: current_user
     ).perform
+    enqueue_branding_enrichment
     if @user
       # Authenticated users (dashboard "add account") and api_only signups
       # need the full response with account_id. API-only deployments have no
@@ -69,6 +70,16 @@ class Api::V1::AccountsController < Api::BaseController
 
   private
 
+  def enqueue_branding_enrichment
+    return if account_params[:email].blank?
+
+    Account::BrandingEnrichmentJob.perform_later(@account.id, account_params[:email])
+    Redis::Alfred.set(format(Redis::Alfred::ACCOUNT_ONBOARDING_ENRICHMENT, account_id: @account.id), '1', ex: 30)
+  rescue StandardError => e
+    # Enrichment is optional — never let queue/Redis failures abort signup
+    ChatwootExceptionTracker.new(e).capture_exception
+  end
+
   def ensure_account_name
     # ensure that account_name and user_full_name is present
     # this is becuase the account builder and the models validations are not triggered