refactor: Create child containers during build as root, not at ai user login

- Renamed init-containers.sh to user-continer.sh
- Moved container creation from ai user first login to build.zsh
- Removed initialization check from ai user .zshrc
- Child containers (workspace, restore-img) now pre-created by root
- ai user simply uses pre-existing containers

cfg/user-continer.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+# Create child containers inside aios for ai user
+# This script runs during build.zsh as root
+
+ROOTFS="root.x86_64/var/lib/machines/aios"
+
+echo "=== Creating child containers ==="
+
+# Create workspace container
+echo "Creating workspace container..."
+mkdir -p /tmp/workspace-build
+pacstrap -c /tmp/workspace-build base
+
+# Configure workspace
+arch-chroot /tmp/workspace-build /bin/sh -c 'pacman -Syu --noconfirm vim git zsh openssh nodejs npm sqlite'
+
+# Add securetty for pts login
+cat >> /tmp/workspace-build/etc/securetty <<'EOF'
+pts/0
+pts/1
+pts/2
+pts/3
+pts/4
+pts/5
+EOF
+
+# Move to aios
+mkdir -p $ROOTFS/var/lib/machines
+mv /tmp/workspace-build $ROOTFS/var/lib/machines/workspace
+
+# Create restore-img as clean backup
+echo "Creating restore-img (backup)..."
+cp -a $ROOTFS/var/lib/machines/workspace $ROOTFS/var/lib/machines/restore-img
+
+echo "✓ Child containers created"
+echo "  - workspace"
+echo "  - restore-img"