Add lock files for package management and update architecture documentation

- Introduced bun.lock and package-lock.json to manage dependencies for the project.
- Enhanced backend API architecture documentation with additional security and documentation guidelines.
- Made minor formatting adjustments across various files for consistency and clarity.

backend-api/CLAUDE.md

@@ -1,6 +1,6 @@
 ---
 description: Use Bun instead of Node.js, npm, pnpm, or vite.
-globs: "*.ts, *.tsx, *.html, *.css, *.js, *.jsx, package.json"
+globs: '*.ts, *.tsx, *.html, *.css, *.js, *.jsx, package.json'
 alwaysApply: false
 ---