Admin protetto, dashboard KPI e aggiornamenti sito marketing.

Login admin con cambio password, metriche server (CPU/RAM/disco/banda), grafici e statistiche streaming; sezione piani ridimensionata.

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

backend/app/services/admin/metrics_store.rb

@@ -0,0 +1,42 @@
+module Admin
+  class MetricsStore
+    HISTORY_KEY = "admin:metrics:history"
+    NET_RX_KEY = "admin:metrics:net_rx"
+    NET_TX_KEY = "admin:metrics:net_tx"
+    HISTORY_LIMIT = 90
+
+    class << self
+      def redis
+        @redis ||= Redis.new(url: ENV.fetch("REDIS_URL", "redis://localhost:6379/0"))
+      rescue Redis::CannotConnectError
+        nil
+      end
+
+      def push_sample(sample)
+        return unless redis
+
+        redis.lpush(HISTORY_KEY, sample.to_json)
+        redis.ltrim(HISTORY_KEY, 0, HISTORY_LIMIT - 1)
+      end
+
+      def history
+        return [] unless redis
+
+        redis.lrange(HISTORY_KEY, 0, HISTORY_LIMIT - 1).map { |row| JSON.parse(row) }.reverse
+      end
+
+      def net_totals
+        return { rx: nil, tx: nil } unless redis
+
+        { rx: redis.get(NET_RX_KEY)&.to_i, tx: redis.get(NET_TX_KEY)&.to_i }
+      end
+
+      def save_net_totals(rx:, tx:)
+        return unless redis
+
+        redis.set(NET_RX_KEY, rx)
+        redis.set(NET_TX_KEY, tx)
+      end
+    end
+  end
+end