Implements CLI customization options for Celtrix so users can tailor the generated project (ports, Git, tooling, extras) directly from the interactive prompts. Closes #53.

[Shriii19]

What this PR does

• Adds an optional “customization” step after stack/language/package‑manager selection.
• Introduces advanced options:
  • Custom server port and client port
  • Optional Git repo initialization with a sensible .gitignore
  • Optional Docker configuration for supported stacks
  • Code formatting setup: ESLint + Prettier / ESLint only / None
  • Additional features:
    • API Documentation (Swagger)
    • Environment variables .env.example template
    • VS Code workspace settings + recommended extensions
    • Pre‑commit hooks (Husky + lint-staged)
    • GitHub Actions CI/CD workflow

CLI flow example

npx celtrix my-app

# After stack/language selection:

? 🎨 Would you like to customize your project configuration? Yes
? 🔌 Server port: 8000
? 🔌 Client port: 5173
? 📦 Initialize Git repository? Yes
? 🐳 Include Docker configuration? Yes
? ✨ Code formatting setup: ESLint + Prettier
? 🚀 Select additional features:
  ◉ API Documentation (Swagger)
  ◉ Environment variables (.env template)
  ◉ VS Code settings
  ◯ Pre-commit hooks (Husky)
  ◯ GitHub Actions CI/CD

[Shriii19]

i have fix the error of issues no #51