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- storage_stats.go (neu): MailActivityStats (60min/24h/7d/30d), StorageEstimateStats - dashboard_handlers.go: Uptime (/proc/uptime), activity + estimate in System-Stats-Response - DashboardTab: Uptime in API-Kachel, neue Kacheln "Mail-Eingang" + "Speicherprognose" - Warnung (Badge "Knapp!") wenn Partition in <90 Tagen voll Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>