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.

frontend-web/.gitignore

@@ -12,6 +12,10 @@ dist
 dist-ssr
 *.local
 
+# Environment variables
+.env
+.env.local
+
 # Editor directories and files
 .vscode/*
 !.vscode/extensions.json