Add build testing and pre-commit hooks

- Add test-build.js script to verify standalone build locally
- Add pre-commit hook with security, build, and test checks
- Copy required-server-files.json to root of standalone for Amplify
- Add husky for automatic pre-commit validation

This ensures we test builds locally before pushing

scripts/pre-commit.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+echo "🔍 Running pre-commit checks..."
+
+# Run security check
+echo "🔐 Checking for credential leaks..."
+npm run security:check
+if [ $? -ne 0 ]; then
+    echo "❌ Security check failed!"
+    exit 1
+fi
+
+# Run build test
+echo "🏗️  Testing build..."
+node scripts/test-build.js
+if [ $? -ne 0 ]; then
+    echo "❌ Build test failed!"
+    exit 1
+fi
+
+# Run tests
+echo "🧪 Running tests..."
+npm test -- --passWithNoTests
+if [ $? -ne 0 ]; then
+    echo "❌ Tests failed!"
+    exit 1
+fi
+
+echo "✅ All pre-commit checks passed!"