Add license key gate, migrate marketing site to separate repo

- install.sh: prompt for license key as first step, validate against
  makeyourown.website/api/validate before any system changes
- setup.sh: secondary key check (format-only if .license-key exists,
  server validation if missing)
- Remove website/ directory — marketing site, keyserver, and deploy
  scripts migrated to the websites repo (git.constantprojects.xyz/
  tankadmin/websites.git) for independent deployment
- Update CLAUDE.md, guide.md, .gitignore to reflect migration

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

install.sh

@@ -52,6 +52,41 @@ show_progress() {
 
 header "WebsiteBox Installer"
 
+# --- License Key ---
+
+section "License Key"
+step "Enter your WebsiteBox license key"
+info "You received this key in your purchase confirmation email."
+info "Format: WBOX-XXXX-XXXX-XXXX-XXXX"
+echo ""
+printf "  License key: "
+read -r LICENSE_KEY < /dev/tty
+
+# Validate format
+if ! echo "$LICENSE_KEY" | grep -qE '^WBOX-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}$'; then
+    err "Invalid key format. Expected: WBOX-XXXX-XXXX-XXXX-XXXX"
+    exit 1
+fi
+
+# Validate with server (burns the key on success)
+step "Verifying license key..."
+VALIDATION_RESPONSE=$(curl -sf -X POST https://makeyourown.website/api/validate \
+    -d "key=${LICENSE_KEY}" 2>/dev/null) || {
+    err "Could not reach the license server."
+    err "Check your internet connection and try again."
+    err "If this persists, contact support@makeyourown.website"
+    exit 1
+}
+
+if echo "$VALIDATION_RESPONSE" | grep -q '"valid": true'; then
+    ok "License key verified and activated."
+else
+    err "Invalid or already-used license key."
+    err "Purchase WebsiteBox at https://makeyourown.website"
+    exit 1
+fi
+echo ""
+
 # --- Check for root/sudo ---
 
 if [ "$(id -u)" -eq 0 ]; then
@@ -244,6 +279,10 @@ fi
 # Make scripts executable
 chmod +x setup.sh install.sh scripts/*.sh
 
+# Save license key
+echo "${LICENSE_KEY}" > "${INSTALL_DIR}/.license-key"
+chmod 600 "${INSTALL_DIR}/.license-key"
+
 # --- Install shell alias ---
 # Adds "websitebox" command that auto-cds into the project directory.
 # Usage: websitebox up, websitebox logs, websitebox down, etc.