Add basic authentication to documentation

- Added .htaccess with Apache basic auth configuration
- Created .htpasswd with username 'langmem' and password 'langmem2025'
- Added auth.js for JavaScript-based authentication backup
- Updated all HTML pages to include authentication script
- Added AUTH_INFO.md with access credentials and setup info

Credentials: langmem / langmem2025

🤖 Generated with [Claude Code](https://claude.ai/code)

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

docs/api/index.html

@@ -6,6 +6,7 @@
     <title>API Documentation - LangMem Fact-Based Memory System</title>
     <meta name="description" content="Complete API documentation for LangMem fact-based memory system with individual fact extraction, deduplication, memory updates, and precision search capabilities.">
     <link rel="stylesheet" href="../assets/css/style.css">
+    <script src="../auth.js"></script>
     <script src="https://cdn.jsdelivr.net/npm/prismjs@1.29.0/components/prism-core.min.js"></script>
     <script src="https://cdn.jsdelivr.net/npm/prismjs@1.29.0/plugins/autoloader/prism-autoloader.min.js"></script>
     <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/prismjs@1.29.0/themes/prism.css">