Commit iniziale di eminuxCRM: CRM Rails con pipeline, campagne email e Docker.

Include autenticazione, progetti isolati, mail marketing HTML con SMTP, test A/B e editor WYSIWYG.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/models/mail_template.rb

@@ -0,0 +1,19 @@
+class MailTemplate < ApplicationRecord
+  include Auditable
+  include HtmlBlankable
+
+  belongs_to :project, optional: true
+  has_many :mailings, dependent: :nullify
+  has_many :mailings_as_b, class_name: "Mailing", foreign_key: :mail_template_b_id, dependent: :nullify
+
+  clears_blank_html :body_html
+  validates :name, :subject, :body_html, presence: true
+
+  scope :for_project, ->(project) {
+    where(project_id: [nil, project&.id].compact).order(:name)
+  }
+
+  def preview_html(organization: nil, contact: nil, project: nil, opportunity: nil)
+    MailMerge.render(body_html, organization:, contact:, project:, opportunity:)
+  end
+end