feat: integrate WebAssembly for zero-latency, offline-first color operations

Replaced REST API dependency with @valknarthing/pastel-wasm (130KB) for
complete browser-based color operations. The application is now fully
static (2.2MB total) with zero network latency and offline support.

**Key Changes:**

1. **WASM Integration:**
   - Added @valknarthing/pastel-wasm dependency (0.1.0)
   - Created lib/api/wasm-client.ts wrapper matching API interface
   - Updated lib/api/client.ts to use WASM client by default
   - All 18 color operations now run locally in browser

2. **Static Export Configuration:**
   - Changed next.config.ts output from 'standalone' to 'export'
   - Disabled image optimization for static export
   - Removed API proxy route (app/api/pastel/[...path]/route.ts)
   - Updated package.json scripts (removed dev:api, added serve)

3. **Docker Optimization:**
   - Migrated from Node.js standalone to nginx-alpine
   - Created nginx.conf with SPA routing and WASM mime types
   - Updated Dockerfile for static file serving
   - Reduced image size from ~150MB to ~25MB
   - Changed port from 3000 to 80 (standard HTTP)
   - Simplified docker-compose.yml (removed pastel-api service)

4. **Documentation Updates:**
   - Updated README.md with WASM benefits and deployment options
   - Added Key Benefits section highlighting zero-latency features
   - Rewrote deployment section for static hosting platforms
   - Updated CLAUDE.md tech stack and architecture
   - Removed obsolete docs: DEV_SETUP.md, DOCKER.md, IMPLEMENTATION_PLAN.md

**Benefits:**
- 🚀 Zero Latency - All operations run locally via WebAssembly
- 📱 Offline First - Works completely offline after initial load
- 🌐 No Backend - Fully static, deploy anywhere
- ⚡ Fast - Native-speed color operations in browser
- 📦 Small - 2.2MB total (130KB WASM, 2.07MB HTML/CSS/JS)

**Deployment:**
Can now be deployed to any static hosting platform:
- Vercel, Netlify, Cloudflare Pages (zero config)
- GitHub Pages, S3, CDN
- Self-hosted nginx/Apache
- Docker (optional, nginx-based)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

CLAUDE.md

@@ -4,19 +4,20 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Overview
 
-**Pastel UI** is a modern, interactive web application for color manipulation, palette generation, and accessibility analysis. Built with Next.js 16 and Tailwind CSS 4, it provides a beautiful interface for all features of the [Pastel API](https://github.com/valknarness/pastel-api).
+**Pastel UI** is a modern, interactive web application for color manipulation, palette generation, and accessibility analysis. Built with Next.js 16 and Tailwind CSS 4, it runs entirely in the browser using WebAssembly for zero-latency color operations.
 
 **Technology Stack:**
-- **Framework**: Next.js 16 (App Router, React 19)
+- **Framework**: Next.js 16 (App Router, React 19, Static Export)
 - **Styling**: Tailwind CSS 4 (CSS-first configuration)
 - **Language**: TypeScript (strict mode)
+- **Color Engine**: `@valknarthing/pastel-wasm` (WebAssembly, 130KB)
 - **State Management**:
   - `@tanstack/react-query` (server state)
   - `zustand` (client state)
 - **Animation**: `framer-motion`
 - **Icons**: `lucide-react`
 - **UI Components**: Custom components + shadcn/ui patterns
-- **API Client**: Type-safe Pastel API integration
+- **Deployment**: Fully static (2.2MB total)
 
 ## Project Structure
 
@@ -43,8 +44,6 @@ pastel-ui/
 │   │   └── page.tsx
 │   ├── docs/                    # Documentation
 │   │   └── page.tsx
-│   └── api/                     # API route handlers (proxy)
-│       └── proxy/[...path]/route.ts
 ├── components/
 │   ├── ui/                      # Base UI components (shadcn/ui style)
 │   │   ├── button.tsx