feat: add UI build to build process

- Created separate build script to handle both CLI and UI building
- Added automatic UI dependency installation
- Copy built UI artifacts to dist directory

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

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

scripts/build.js

@@ -0,0 +1,35 @@
+#!/usr/bin/env node
+
+const { execSync } = require('child_process');
+const path = require('path');
+const fs = require('fs');
+
+console.log('Building Claude Code Router...');
+
+try {
+  // Build the main CLI application
+  console.log('Building CLI application...');
+  execSync('esbuild src/cli.ts --bundle --platform=node --outfile=dist/cli.js', { stdio: 'inherit' });
+  
+  // Copy the tiktoken WASM file
+  console.log('Copying tiktoken WASM file...');
+  execSync('shx cp node_modules/tiktoken/tiktoken_bg.wasm dist/tiktoken_bg.wasm', { stdio: 'inherit' });
+  
+  // Build the UI
+  console.log('Building UI...');
+  // Check if node_modules exists in ui directory, if not install dependencies
+  if (!fs.existsSync('ui/node_modules')) {
+    console.log('Installing UI dependencies...');
+    execSync('cd ui && npm install', { stdio: 'inherit' });
+  }
+  execSync('cd ui && npm run build', { stdio: 'inherit' });
+  
+  // Copy the built UI index.html to dist
+  console.log('Copying UI build artifacts...');
+  execSync('shx cp ui/dist/index.html dist/index.html', { stdio: 'inherit' });
+  
+  console.log('Build completed successfully!');
+} catch (error) {
+  console.error('Build failed:', error.message);
+  process.exit(1);
+}