feat: add human-readable RAID recovery formatting with German time units and improved member detection from mdstat

Add format_transfer_rate() to convert mdstat rates (e.g., 133628K/sec) into readable values like "130.5 MB/s" using 1024-based units. Add format_remaining_time() to convert mdstat durations (e.g., 450.1min) into compact German format like "7 Std. 30 Min." with day/hour/minute components. Update raid_status() to parse member devices directly from array_line in /proc/mdstat to avoid cross

static/sw.js

@@ -1,4 +1,4 @@
-const CACHE_NAME = 'media-dashboard-shell-v1';
+const CACHE_NAME = 'media-max-shell-v2';
 const SHELL = ['/static/media-mark.svg', '/static/manifest.json'];
 
 self.addEventListener('install', event => {