New page /admin/status.php gives a real-time health dashboard:
- Services panel: nginx (systemctl), php-fpm (auto-detects versioned unit names),
site HTTP ping (curl HEAD with latency), SQLite DB (exists/writable/row count/size),
storage directory (writable, banner/cover file counts), maintenance-mode flag.
- PHP runtime panel: version, SAPI, memory_limit, upload_max_filesize, post_max_size,
max_execution_time.
- Disk usage bar for the partition containing APP_ROOT (colour-coded: green/amber/red).
- All shell calls go through safeExec() which suppresses stderr and checks exit code;
systemctl/curl unavailability degrades gracefully to 'unknown' without fatal errors.
- 'Statut' nav link added to templates/admin/head.php (active state on status.php).
