feat: Tailwind CSS support via --tailwind flag (closes #1)

[DEADSERPENT]

What this PR does

Implements Tailwind CSS support as requested in #1.

Adds an optional --tailwind flag that works with both Vite and CRA projects and can be combined with existing flags such as --ts and --folders.

Changes

• Added --tailwind option to the CLI
• Wired Tailwind generation through the scaffold pipeline
• Added Tailwind-aware templates for Vite projects
• Added Tailwind-aware templates for CRA projects
• Added a new Tailwind generator

Tailwind v4 Support

Vite

• Installs tailwindcss and @tailwindcss/vite
• Registers the Vite plugin automatically
• Creates src/index.css with Tailwind import

CRA

• Installs tailwindcss and @tailwindcss/postcss
• Creates postcss.config.js
• Creates src/index.css with Tailwind import

Usage

npx react-clean-start my-app --tailwind
npx react-clean-start my-app --tailwind --ts
npx react-clean-start my-app --tailwind --cra
npx react-clean-start my-app --tailwind --ts --cra

Issue

Closes #1

[sri443]

Thanks for the PR! Vite + Tailwind is working fine from my testing.

I found an issue with the CRA + Tailwind path where the setup generates but the Tailwind classes aren't being applied correctly. I'm currently working on a fix for the CRA integration on my side, so no action needed from you for now.

Everything else looks good so far. Once I've got the CRA setup working properly, I'll move ahead with the merge.