refactor: Simplify startup - user manages containers and MCP

Changes:
- Delete cfg/setup-claude.sh (MCP setup now manual)
- Remove restore container creation (user manages backups)
- Remove workspace auto-entry from .zshrc
- Remove MCP auto-registration
- Change ai user .zshrc to run claude once on login (not exec)
- User now manually starts containers and registers MCP as needed

New flow:
1. ai user auto-login
2. claude starts once (not exec, returns to shell after exit)
3. User manually starts workspace container if needed
4. User manually registers MCP servers

cfg/user-continer.sh

@@ -1,10 +1,10 @@
 #!/bin/bash
-# Create child containers inside aios for ai user
+# Create workspace container inside aios for ai user
 # Backup aios before creating /var/lib/machines to avoid recursion
 
 ROOTFS="root.x86_64"
 
-echo "=== Creating child containers ==="
+echo "=== Creating workspace container ==="
 
 # Backup current aios to temp location (before creating /var/lib/machines)
 echo "Backing up aios..."
@@ -17,11 +17,7 @@ mkdir -p $ROOTFS/var/lib/machines
 echo "Creating workspace container..."
 cp -a /tmp/aios-backup-$$ $ROOTFS/var/lib/machines/workspace
 
-# Copy backup as restore
-echo "Creating restore container..."
-cp -a /tmp/aios-backup-$$ $ROOTFS/var/lib/machines/restore
-
 # Cleanup temp backup
 rm -rf /tmp/aios-backup-$$
 
-echo "✓ Child containers created"
+echo "✓ Workspace container created"