Fix install-breaking and live-boot bugs, verified on real hardware

Boot-critical (each confirmed with a real boot/install cycle, not just
code review):

- Live ISO's liveuser shell is zsh, but Hyprland autostart was written
  to .bash_profile (never runs) — moved to .zprofile, and switched to
  start-hyprland (Hyprland's own watchdog wrapper; raw `exec Hyprland`
  is no longer the recommended launch method).
- copytoram (self-enables on most real hardware: non-optical boot +
  image < 4GiB + enough free RAM) unmounts /run/archiso/bootmnt, which
  unpackfs.conf and bos-copy-kernel both hardcoded as their source —
  broke the installer outright on real hardware, confirmed by forcing
  copytoram=y. Added a resolver step for unpackfs, and switched the
  kernel copy to /usr/lib/modules/$(uname -r)/vmlinuz (part of the live
  squashfs itself, unaffected by copytoram).
- BIOS installs got no bootloader — post-install.sh only ever ran the
  UEFI grub-install path despite BOS shipping bios.syslinux. Added a
  BIOS branch with disk auto-detection.
- @snapshots/@log/@cache were never real: iso/partition.conf's
  btrfsSubvolumes key isn't part of this Calamares version's partition
  module schema at all (same class of bug as the userShell fix below —
  silently ignored). Calamares only natively creates @ and @home.
  post-install.sh now creates the three subvolumes by hand after
  unpackfs, migrates existing /var/log + /var/cache content into them
  before mounting over, and adds the fstab entries — verified end to
  end on real hardware, including grub-btrfs generating bootable
  snapshot menu entries. The unmount step in the existing snapper
  create-config dance also gained retry + lazy-unmount fallback after
  a real chroot run hit a transient busy-mount race.
- Default shell was bash instead of zsh post-install: users.conf's
  top-level `userShell` key isn't part of this Calamares version's
  users module schema either — the real key is nested (user.shell).
- graphical-session.target ships RefuseManualStart=yes (systemd
  convention), so the earlier attempt to activate it from hyprland.lua
  silently failed and breadclipd (WantedBy=graphical-session.target)
  never started. Starts breadclipd.service directly instead.
- /etc/os-release was never set (showed "Arch Linux"); live boot never
  had quiet/splash/plymouth wired in (raw kernel scroll the whole
  time) despite BOS already shipping a complete bread-logo+spinner
  plymouth theme for the installed system.

Also: generalized build-local.sh's per-service skel baking (previously
only breadd.service was hand-committed; breadbox-sync/breadmill/
breadclipd never shipped), added the four new bakery packages to
BREAD_BINS, removed the redundant cliphist/fzf clipboard pipeline in
favor of breadclip, mirrored fastfetch's bread-logo config into skel,
and fixed a stale bos-update comment.

iso/efiboot/loader/entries/01-archiso-linux-copytoram.conf

@@ -2,4 +2,4 @@ title    Bread OS install medium (copy to RAM, UEFI)
 sort-key 015
 linux    /%INSTALL_DIR%/boot/%ARCH%/vmlinuz-linux
 initrd   /%INSTALL_DIR%/boot/%ARCH%/initramfs-linux.img
-options  archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID% copytoram=y
+options  archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID% copytoram=y quiet splash vt.global_cursor_default=0 systemd.show_status=false rd.systemd.show_status=false rd.udev.log_level=3

iso/efiboot/loader/entries/01-archiso-linux.conf

@@ -2,4 +2,4 @@ title    Bread OS install medium (%ARCH%, UEFI)
 sort-key 01
 linux    /%INSTALL_DIR%/boot/%ARCH%/vmlinuz-linux
 initrd   /%INSTALL_DIR%/boot/%ARCH%/initramfs-linux.img
-options  archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID%
+options  archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID% quiet splash vt.global_cursor_default=0 systemd.show_status=false rd.systemd.show_status=false rd.udev.log_level=3