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/concerns/html_blankable.rb

@@ -0,0 +1,18 @@
+module HtmlBlankable
+  extend ActiveSupport::Concern
+
+  class_methods do
+    def clears_blank_html(*attributes)
+      before_validation do
+        attributes.each do |attribute|
+          value = public_send(attribute)
+          public_send("#{attribute}=", "") if HtmlBlankable.blank_html?(value)
+        end
+      end
+    end
+  end
+
+  def self.blank_html?(html)
+    html.to_s.gsub(/<[^>]*>/, " ").gsub("&nbsp;", " ").gsub(/\s+/, " ").strip.blank?
+  end
+end