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>

setup.sh

@@ -23,6 +23,42 @@ printf "\n${WHITE}════════════════════
 printf "  ${BOLD}WebsiteBox Setup Wizard${RESET}\n"
 printf "${WHITE}═══════════════════════════════════════════════════════════${RESET}\n\n"
 
+# --- License Key Check ---
+
+if [ -f ".license-key" ]; then
+    LICENSE_KEY=$(cat .license-key)
+    if ! echo "$LICENSE_KEY" | grep -qE '^WBOX-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}$'; then
+        printf "${RED}  ✗ Invalid license key in .license-key file.${RESET}\n"
+        printf "${RED}    Re-run install.sh or contact support@makeyourown.website${RESET}\n"
+        exit 1
+    fi
+else
+    printf "${YELLOW}  ⚠ No license key found.${RESET}\n"
+    printf "  Enter your WebsiteBox license key: "
+    read -r LICENSE_KEY
+    if ! echo "$LICENSE_KEY" | grep -qE '^WBOX-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}-[A-Z0-9]{4}$'; then
+        printf "${RED}  ✗ Invalid key format. Expected: WBOX-XXXX-XXXX-XXXX-XXXX${RESET}\n"
+        exit 1
+    fi
+    # Validate with server (burns the key)
+    printf "  Verifying license key...\n"
+    VALIDATION_RESPONSE=$(curl -sf -X POST https://makeyourown.website/api/validate \
+        -d "key=${LICENSE_KEY}" 2>/dev/null) || {
+        printf "${RED}  ✗ Could not reach the license server. Try again later.${RESET}\n"
+        exit 1
+    }
+    if echo "$VALIDATION_RESPONSE" | grep -q '"valid": true'; then
+        printf "${GREEN}  ✓ License key verified and activated.${RESET}\n"
+        echo "$LICENSE_KEY" > .license-key
+        chmod 600 .license-key
+    else
+        printf "${RED}  ✗ Invalid or already-used license key.${RESET}\n"
+        printf "${RED}    Purchase WebsiteBox at https://makeyourown.website${RESET}\n"
+        exit 1
+    fi
+fi
+echo ""
+
 # --- Prerequisite Checks ---
 
 check_command() {