refactor: make non-streaming chat as /chat/request route (#20)

e2e/basic.spec.ts

helpers/types.ts

questions.ts

templates/types/simple/express/README-template.md

templates/types/simple/express/eslintrc.json

templates/types/simple/express/gitignore

templates/types/simple/express/index.ts

templates/types/simple/express/package.json

...lates/types/simple/express/src/controllers/engine/chat.ts

templates/types/simple/express/src/observability/index.ts

templates/types/simple/express/src/routes/chat.route.ts

templates/types/simple/express/tsconfig.json

templates/types/simple/fastapi/app/__init__.py

templates/types/simple/fastapi/app/api/__init__.py

templates/types/simple/fastapi/app/api/routers/__init__.py

templates/types/simple/fastapi/app/api/routers/chat.py

templates/types/simple/fastapi/app/engine/__init__.py

templates/types/simple/fastapi/app/settings.py

templates/types/simple/fastapi/gitignore

templates/types/simple/fastapi/main.py