Aggiunge annunci in-app/sito, contatti e migliora UI copertina sul portale.

Include admin/API/banner nativi, form contatti e reset copertina standard con layout edit più ampio.

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

backend/app/models/app_announcement.rb

@@ -0,0 +1,93 @@
+class AppAnnouncement < ApplicationRecord
+  KINDS = %w[info maintenance update].freeze
+  SEVERITIES = %w[info warning critical].freeze
+  STATUSES = %w[draft published archived].freeze
+  CHANNELS = {
+    app: :show_on_app,
+    web_public: :show_on_web_public,
+    web_private: :show_on_web_private
+  }.freeze
+
+  belongs_to :created_by_admin, class_name: "AdminAccount", optional: true
+
+  validates :kind, :severity, :status, :title, :body, presence: true
+  validates :kind, inclusion: { in: KINDS }
+  validates :severity, inclusion: { in: SEVERITIES }
+  validates :status, inclusion: { in: STATUSES }
+  validates :title, length: { maximum: 120 }
+  validates :body, length: { maximum: 2000 }
+  validates :action_label, length: { maximum: 40 }, allow_blank: true
+  validates :action_url, format: { with: /\Ahttps?:\/\/.+/i, allow_blank: true }
+  validate :ends_at_after_starts_at
+  validate :at_least_one_channel
+
+  scope :newest, -> { order(created_at: :desc) }
+  scope :published, -> { where(status: "published") }
+  scope :active_now, lambda {
+    now = Time.current
+    published
+      .where("starts_at IS NULL OR starts_at <= ?", now)
+      .where("ends_at IS NULL OR ends_at > ?", now)
+  }
+
+  def self.for_channel(channel)
+    column = CHANNELS[channel.to_sym]
+    raise ArgumentError, "unknown announcement channel: #{channel}" if column.blank?
+
+    active_now.where(column => true)
+  end
+
+  def self.for_app
+    for_channel(:app)
+  end
+
+  def published?
+    status == "published"
+  end
+
+  def selected_channels
+    CHANNELS.each_with_object([]) do |(key, column), keys|
+      keys << key if public_send(column)
+    end
+  end
+
+  def as_api_json(platform: nil)
+    {
+      id: id,
+      kind: kind,
+      severity: severity,
+      title: title,
+      body: body,
+      dismissible: dismissible,
+      action_url: resolved_action_url(platform),
+      action_label: action_label.presence,
+      starts_at: starts_at&.iso8601,
+      ends_at: ends_at&.iso8601
+    }
+  end
+
+  def resolved_action_url(platform)
+    return action_url if action_url.present?
+    return nil unless kind == "update"
+
+    case platform.to_s
+    when "android" then MatchLiveTv.play_store_url
+    when "ios" then MatchLiveTv.app_store_url
+    end
+  end
+
+  private
+
+  def at_least_one_channel
+    return if show_on_app? || show_on_web_public? || show_on_web_private?
+
+    errors.add(:base, :no_channel)
+  end
+
+  def ends_at_after_starts_at
+    return if starts_at.blank? || ends_at.blank?
+    return if ends_at > starts_at
+
+    errors.add(:ends_at, :invalid)
+  end
+end