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/controllers/mail_images_controller.rb

@@ -0,0 +1,30 @@
+class MailImagesController < ApplicationController
+  before_action :require_current_project!
+
+  MAX_BYTES = 5.megabytes
+  ALLOWED_TYPES = %w[image/jpeg image/png image/gif image/webp].freeze
+
+  def create
+    file = params[:file]
+    unless file.respond_to?(:content_type)
+      return render json: { error: "Seleziona un'immagine." }, status: :unprocessable_entity
+    end
+
+    content_type = Marcel::MimeType.for(file, name: file.original_filename, declared_type: file.content_type)
+    unless ALLOWED_TYPES.include?(content_type)
+      return render json: { error: "Formato non valido. Usa JPG, PNG, GIF o WebP." }, status: :unprocessable_entity
+    end
+
+    if file.size > MAX_BYTES
+      return render json: { error: "L'immagine supera i 5 MB." }, status: :unprocessable_entity
+    end
+
+    blob = ActiveStorage::Blob.create_and_upload!(
+      io: file,
+      filename: file.original_filename.presence || "immagine",
+      content_type: content_type
+    )
+
+    render json: { url: url_for(blob) }
+  end
+end