feat: NVIDIA PRIME, audio fix, timezone, dmesg error cleanup

- Add nvidia/nvidia-dkms/nvidia-libs-32bit/nvidia-vaapi-driver to niri
  live and installed profiles; wireless-regdb and sof-firmware to all
  profiles (fixes regulatory.db and SOF firmware dmesg errors)

- iso/postsetup-nvidia.sh: new mklive -x hook that re-runs dracut inside
  the rootfs chroot after the overlay is applied; ensures the squashfs
  initramfs includes nvidia.ko and omits nouveau.ko at build time —
  no driver install needed at runtime (fixes /run tmpfs overflow that was
  killing wireplumber by corrupting D-Bus sockets)

- Both ISO inner build scripts gain -x postsetup-nvidia.sh and the nonfree
  repo flag so nvidia packages resolve correctly

- niri config: wireplumber started via supervisor loop (waits for PipeWire
  socket, auto-restarts on crash) replacing the one-shot exec — survives
  any D-Bus or pipewire disruption

- build-niri-live-iso.sh: NVIDIA modprobe blacklist-nouveau.conf,
  btusb-quirks.conf, modules-load.d/nvidia.conf, dracut/10-nvidia.conf,
  Xorg intel/nvidia configs, prime-run helper, elogind run script loop
  guard, timezone Europe/Zurich overlay, updated BOOT_CMDLINE

- build-live-iso.sh: same NVIDIA + timezone + sound udev rule overlays;
  live-setup.sh timezone and audio group fix

- installer/lib/grub.sh: GRUB_CMDLINE_LINUX_DEFAULT gains
  nvidia-drm.modeset=1 rd.driver.blacklist=nouveau btusb.enable_autosuspend=0

- installer/lib/postinstall.sh: configure_nvidia_prime() adds
  blacklist-nouveau.conf, btusb-quirks.conf, dracut omit_drivers nouveau,
  modules-load.d with all four nvidia modules

installer/lib/grub.sh

@@ -18,7 +18,7 @@ install_grub() {
 GRUB_DEFAULT=0
 GRUB_TIMEOUT=5
 GRUB_DISTRIBUTOR="Void"
-GRUB_CMDLINE_LINUX_DEFAULT="loglevel=4 nvidia-drm.modeset=1"
+GRUB_CMDLINE_LINUX_DEFAULT="loglevel=4 nvidia-drm.modeset=1 rd.driver.blacklist=nouveau modprobe.blacklist=nouveau btusb.enable_autosuspend=0"
 GRUB_CMDLINE_LINUX=""
 GRUB_DISABLE_OS_PROBER=false
 GRUB_TERMINAL_OUTPUT="gfxterm"

installer/lib/postinstall.sh

@@ -160,7 +160,19 @@ Section "OutputClass"
 EndSection
 EOF
 
-    # 2) Modules to load early for KMS.
+    # 2) Blacklist nouveau so it doesn't grab the GPU before nvidia loads.
+    install -d -m 0755 "$TARGET/etc/modprobe.d"
+    cat > "$TARGET/etc/modprobe.d/blacklist-nouveau.conf" <<'EOF'
+blacklist nouveau
+options nouveau modeset=0
+EOF
+
+    # btusb USB autosuspend causes firmware download failures on Intel BT.
+    cat > "$TARGET/etc/modprobe.d/btusb-quirks.conf" <<'EOF'
+options btusb enable_autosuspend=0
+EOF
+
+    # 3) Modules to load early for KMS.
     install -d -m 0755 "$TARGET/etc/modules-load.d"
     cat > "$TARGET/etc/modules-load.d/nvidia.conf" <<'EOF'
 nvidia
@@ -169,7 +181,7 @@ nvidia_uvm
 nvidia_drm
 EOF
 
-    # 3) Wrapper script + desktop file: run any app on NVIDIA via `prime-run`.
+    # 4) Wrapper script + desktop file: run any app on NVIDIA via `prime-run`.
     install -d -m 0755 "$TARGET/usr/local/bin"
     cat > "$TARGET/usr/local/bin/prime-run" <<'EOF'
 #!/bin/sh
@@ -181,10 +193,11 @@ exec env __NV_PRIME_RENDER_OFFLOAD=1 \
 EOF
     chmod 0755 "$TARGET/usr/local/bin/prime-run"
 
-    # 4) Make sure dracut picks up nvidia modules.
+    # 5) dracut: include nvidia modules in initramfs; explicitly omit nouveau.
     install -d -m 0755 "$TARGET/etc/dracut.conf.d"
     cat > "$TARGET/etc/dracut.conf.d/10-nvidia.conf" <<'EOF'
 add_drivers+=" nvidia nvidia_modeset nvidia_uvm nvidia_drm "
+omit_drivers+=" nouveau "
 EOF
 
     ok "NVIDIA PRIME offload configured (use 'prime-run <app>')"