feat(iso): rebrand to EASY-BEE with ASCII art banner

Replace "Bee Hardware Audit" branding with EASY-BEE across bootloader
and LiveCD: grub.cfg menu entries, echo ASCII art before menu,
motd banner, iso-volume and iso-application metadata.

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

iso/builder/auto/config

@@ -21,8 +21,8 @@ lb config noauto \
     --linux-flavours "amd64" \
     --linux-packages "linux-image-amd64" \
     --memtest none \
-    --iso-volume "BEE" \
-    --iso-application "Bee Hardware Audit" \
+    --iso-volume "EASY-BEE" \
+    --iso-application "EASY-BEE" \
     --bootappend-live "boot=live components console=tty0 console=ttyS0,115200n8 username=bee user-fullname=Bee modprobe.blacklist=nouveau" \
     --apt-recommends false \
     "${@}"