Add CLAUDE.md for Claude Code guidance

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Static HTML marketing website for Anvil Hosting services, deployed on Cloudflare Pages.
+
+- **URL**: https://hosting.anvil.it.com
+- **Language**: Korean (한글)
+
+## Deployment
+
+```bash
+wrangler pages deploy . --project-name anvil-hosting
+```
+
+No build step required - deploy directly.
+
+## Architecture
+
+Single-file website (`index.html`, ~1000 lines) containing:
+- Inline Tailwind CSS configuration
+- Inline styles for hand-drawn sketch aesthetic
+- Vanilla JavaScript for chat widget toggle
+
+### Tech Stack
+- Tailwind CSS (CDN)
+- Rough.js (hand-drawn SVG effects)
+- Google Fonts: Noto Sans KR (body), Caveat (decorative)
+
+### Design System
+- Hand-drawn/sketch aesthetic with custom border-radius and shadows
+- Color palette: sketch-blue, sketch-red, sketch-green, sketch-orange, sketch-purple, sketch-yellow
+- Background: cream (#fffce8) with grid pattern
+
+### Page Sections
+Navigation → Hero → Services (`#services`) → Domain Service (`#domain`) → Features (`#features`) → Linux Guide (`#linux-guide`) → Pricing (`#pricing`) → Contact (`#contact`)
+
+## External Integrations
+
+- **Chat Widget**: Embedded iframe from `chat-frontend-4wf.pages.dev` (separate deployment)
+- **Telegram Bot**: @AnvilForgeBot for domain registration
+- **Credentials**: Stored in Vault at https://vault.anvil.it.com
+- **Registrant Info Source**: npm-linode-1 server (`/home/admin/namecheap_api/.env`)