Add Claude Code GitHub Workflow (#190)

CLAUDE.md

@@ -1,7 +1,9 @@
-# Unsend Project Guidelines
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
 
 ## Commands
-- **Build**: `pnpm build` (specific: `pnpm build:web`, `pnpm build:editor`)
+- **Build**: `pnpm build` (specific: `pnpm build:web`, `pnpm build:editor`, `pnpm build:marketing`)
 - **Lint**: `pnpm lint`
 - **Dev**: `pnpm dev` (or `pnpm d` for setup + dev)
 - **DB**: `pnpm db:migrate-dev`, `pnpm db:studio`, `pnpm db:push`
@@ -18,4 +20,34 @@
 - **Error Handling**: Use try/catch with specific error types
 - **API**: Use tRPC for internal, Hono for public API endpoints
 
-Follow Vercel style guides with strict TypeScript. Be thoughtful, write readable code over premature optimization.
+Follow Vercel style guides with strict TypeScript. Be thoughtful, write readable code over premature optimization.
+
+## Architecture Overview
+
+Unsend is an open-source email sending infrastructure built as a monorepo with the following structure:
+
+### Core Applications
+- **web** (`apps/web`): Main Next.js dashboard application with tRPC API, Prisma ORM, authentication
+- **marketing** (`apps/marketing`): Marketing website built with Next.js
+- **smtp-server** (`apps/smtp-server`): SMTP server implementation
+- **docs** (`apps/docs`): Documentation using Mintlify
+
+### Shared Packages
+- **email-editor** (`packages/email-editor`): Rich email editor using TipTap, JSX Email
+- **ui** (`packages/ui`): Shared UI components using shadcn/ui and Tailwind
+- **sdk** (`packages/sdk`): Client SDK for Unsend API
+- **eslint-config**, **typescript-config**, **tailwind-config**: Shared configurations
+
+### Key Technologies
+- **Frontend**: Next.js 15, React 19, Tailwind CSS, shadcn/ui, Framer Motion
+- **Backend**: tRPC, Prisma, PostgreSQL, Redis (BullMQ queues)
+- **Email**: AWS SES, JSX Email, custom email editor
+- **Auth**: NextAuth.js with GitHub/Google providers
+- **API**: Hono for public REST API with OpenAPI/Swagger
+- **Infrastructure**: Docker, Railway deployment ready
+
+### Development Workflow
+- Uses Turbo for monorepo builds and development
+- Environment setup with `pnpm dx` (installs deps, starts Docker, runs migrations)
+- Database operations prefixed with `pnpm db:`
+- Each package has independent linting and building