Make setup ISO-only

Remove legacy online installer entrypoints, collapse migrations for 4.0, and move setup responsibilities into target-side system, hardware, and user commands.

install/hardware/intel/lpmd.sh

@@ -0,0 +1,11 @@
+# Install Intel Low Power Mode Daemon for supported hybrid Intel CPUs (Alder Lake and newer)
+# Supported models: Alder Lake (151/154), Raptor Lake (183/186/191),
+# Meteor Lake (170/172), Lunar Lake (189), Panther Lake (204)
+
+if omarchy-hw-intel && omarchy-battery-present; then
+  cpu_model=$(grep -m1 "^model\s*:" /proc/cpuinfo 2>/dev/null | cut -d: -f2 | tr -d ' ')
+  if [[ "$cpu_model" =~ ^(151|154|170|172|183|186|189|191|204)$ ]]; then
+    omarchy-pkg-add intel-lpmd
+    sudo systemctl enable intel_lpmd.service
+  fi
+fi