Adding the project for code injection and XSS vulnerability testing

This project is designed to help developers understand and mitigate code injection and XSS vulnerabilities. It includes a backend API and a frontend interface for testing various attack vectors in a controlled environment.

backend/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Optional npm cache
+.npm
+.eslintcache
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage/
+.nyc_output/
+
+# Build output
+dist/
+build/
+out/
+public/
+
+# Next.js
+.next/
+
+# Nuxt
+.nuxt/
+
+# Gatsby
+.cache/
+
+# Parcel
+.parcel-cache/
+
+# TypeScript
+*.tsbuildinfo
+
+# Environment variables
+.env
+.env.*.local
+.env.local
+
+# IDEs and editors
+.idea/
+.vscode/
+*.sublime-workspace
+*.sublime-project
+
+# System files
+.DS_Store
+Thumbs.db
+
+# Misc
+*.tgz
+*.zip
+*.log.*
+tmp/
+temp/
+
+# Codetyper.nvim - AI coding partner files
+*.coder.*
+.coder/
+.claude/