feat(lifecycle): add Captain::Lifecycle::Config model

enterprise/app/models/captain/lifecycle.rb

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+# frozen_string_literal: true
+
+module Captain::Lifecycle
+end

enterprise/app/models/captain/lifecycle/config.rb

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+# frozen_string_literal: true
+
+class Captain::Lifecycle::Config < ApplicationRecord
+  self.table_name = 'captain_lifecycle_configs'
+
+  belongs_to :account
+  belongs_to :opt_out_label, class_name: 'Label', optional: true
+
+  validates :account_id, uniqueness: true
+  validates :min_interval_minutes, numericality: { greater_than_or_equal_to: 0 }
+  validates :pause_on_customer_reply_within_minutes, numericality: { greater_than_or_equal_to: 0 }
+
+  def self.for_account(account)
+    find_or_create_by!(account_id: account.id)
+  end
+end

spec/enterprise/models/captain/lifecycle/config_spec.rb

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+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Captain::Lifecycle::Config, type: :model do
+  describe 'associations' do
+    it { is_expected.to belong_to(:account) }
+    it { is_expected.to belong_to(:opt_out_label).class_name('Label').optional }
+  end
+
+  describe 'validations' do
+    subject { build(:captain_lifecycle_config) }
+
+    it { is_expected.to validate_uniqueness_of(:account_id) }
+    it { is_expected.to validate_numericality_of(:min_interval_minutes).is_greater_than_or_equal_to(0) }
+    it { is_expected.to validate_numericality_of(:pause_on_customer_reply_within_minutes).is_greater_than_or_equal_to(0) }
+  end
+
+  describe '.for_account' do
+    let(:account) { create(:account) }
+
+    it 'returns existing config when present' do
+      config = create(:captain_lifecycle_config, account: account)
+      expect(described_class.for_account(account)).to eq(config)
+    end
+
+    it 'creates default config when missing' do
+      expect { described_class.for_account(account) }
+        .to change(described_class, :count).by(1)
+    end
+
+    it 'defaults have quiet_hours disabled' do
+      config = described_class.for_account(account)
+      expect(config.quiet_hours_enabled).to be(false)
+    end
+  end
+end

spec/factories/captain_lifecycle_configs.rb

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+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :captain_lifecycle_config, class: 'Captain::Lifecycle::Config' do
+    account
+    quiet_hours_enabled { false }
+    quiet_hours_from { '23:00' }
+    quiet_hours_to { '08:00' }
+    min_interval_minutes { 30 }
+    pause_on_customer_reply { false }
+    pause_on_customer_reply_within_minutes { 60 }
+  end
+end