feat(account): add report_hidden_metrics setting

Add report_hidden_metrics to account settings schema to allow
hiding specific metrics from reports on a per-account basis.

Supported metrics: outgoing_messages_count, incoming_messages_count, reply_time

app/models/account.rb

@@ -67,6 +67,13 @@ class Account < ApplicationRecord
             'help_center_search': { 'type': %w[boolean null] }
           },
           'additionalProperties': false
+        },
+        'report_hidden_metrics': {
+          'type': %w[array null],
+          'items': {
+            'type': 'string',
+            'enum': %w[outgoing_messages_count incoming_messages_count reply_time]
+          }
         }
       },
     'required': [],
@@ -88,6 +95,7 @@ class Account < ApplicationRecord
 
   store_accessor :settings, :audio_transcriptions, :auto_resolve_label
   store_accessor :settings, :captain_models, :captain_features
+  store_accessor :settings, :report_hidden_metrics
 
   has_many :account_users, dependent: :destroy_async
   has_many :agent_bot_inboxes, dependent: :destroy_async