feat: task queue, UI overhaul, burn tests, install-to-RAM

- Task queue: all SAT/audit jobs enqueue and run one-at-a-time;
  tasks persist past page navigation; new Tasks page with cancel/priority/log stream
- UI: consolidate nav (Validate, Burn, Tasks, Tools); Audit becomes modal;
  Dashboard hardware summary badges + split metrics charts (load/temp/power);
  Tools page consolidates network, services, install, support bundle
- AMD GPU: acceptance test and stress burn cards; GPU presence API greys
  out irrelevant SAT cards automatically
- Burn tests: Memory Stress (stress-ng --vm), SAT Stress (stressapptest)
- Install to RAM: copies squashfs to /dev/shm, re-associates loop devices
  via LOOP_CHANGE_FD ioctl so live media can be ejected
- Charts: relative time axis (0 = now, negative left)
- memtester: LimitMEMLOCK=infinity in bee-web.service; empty output → UNSUPPORTED
- SAT overlay applied dynamically on every /audit.json serve
- MIME panic guard for LiveCD ramdisk I/O errors
- ISO: add memtest86+, stressapptest packages; memtest86+ GRUB entry;
  disable screensaver/DPMS in bee-openbox-session
- Unknown SAT status severity = 1 (does not override OK)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/internal/platform/install_to_ram_linux.go

@@ -0,0 +1,28 @@
+//go:build linux
+
+package platform
+
+import (
+	"os"
+	"syscall"
+)
+
+const ioctlLoopChangeFD = 0x4C08
+
+func loopChangeFD(loopDev, newFile string) error {
+	lf, err := os.OpenFile(loopDev, os.O_RDWR, 0)
+	if err != nil {
+		return err
+	}
+	defer lf.Close()
+	nf, err := os.OpenFile(newFile, os.O_RDONLY, 0)
+	if err != nil {
+		return err
+	}
+	defer nf.Close()
+	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, lf.Fd(), ioctlLoopChangeFD, nf.Fd())
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}