Update backend source

fix(build): switch to CommonJS format for Express compatibility

refactor: TypeScript monorepo cleanup for HF/Vercel deployment

chore(release): stable checkpoint v1.1.0 - fixed memory system integration and tests

fix: externalize dotenv to prevent dynamic require error

Fix Docker build and runtime errors for Hugging Face

fix: switch backend build to ESM

fix: install esbuild globally in Dockerfile

fix: add esbuild to root devDeps and use direct path

fix: use npx --package=esbuild for Docker builds

fix: change build script to esbuild (bypass TypeScript errors)

fix: esbuild Docker build + email:new EventType for HuggingFace deployment

fix: update package paths for standalone deployment

Minimal HF Spaces deployment