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

build.zsh

@@ -86,14 +86,7 @@ bash ./cfg/setup-user.sh
 echo ""
 
 # ============================================
-# 3. Claude & aigpt Setup
-# ============================================
-
-bash ./cfg/setup-claude.sh
-echo ""
-
-# ============================================
-# 4. Create child containers (after all configuration)
+# 3. Create workspace container (after all configuration)
 # ============================================
 
 bash ./cfg/user-continer.sh