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/user/first-run/wifi.sh

@@ -0,0 +1,22 @@
+notify_update() {
+  (
+    if [[ -n $(omarchy-notification-send -u critical -g  "Update System" "$1" -a) ]]; then
+      omarchy-launch-floating-terminal-with-presentation omarchy-update
+    fi
+  ) >/dev/null 2>&1 &
+}
+
+notify_wifi() {
+  (
+    if [[ -n $(omarchy-notification-send -u critical -g 󰖩 "Click to Setup Wi-Fi" -a) ]]; then
+      omarchy-shell omarchy.network toggle
+    fi
+  ) >/dev/null 2>&1 &
+}
+
+if ! ping -c3 -W1 1.1.1.1 >/dev/null 2>&1; then
+  notify_update "When you have internet, click to update the system."
+  notify_wifi
+else
+  notify_update "Click to update the system."
+fi