Add AWS serverless build output and isolate client route modules

[PatriciaJacob]

Summary

• add an AST-based client transform that strips server-only route loaders and imports from browser bundles
• generate native Lambda SSR output plus AWS deployment artifacts for S3, CloudFront, and Lambda routing
• replace the production Express server with a minimal Node HTTP server that reuses the SSR runtime
• move build-time tooling such as Vite, TypeScript, and esbuild to devDependencies
• document the AWS deployment outputs in the README

Testing

• npm run build
• invoke generated dist/server/lambda-handler.js for /user-profile
• invoke generated dist/server/lambda-handler.js for /__matcha_props?path=%2Fuser-profile