feat: comfy dev env (ts, jest, prettier, eslint)

backend/.editorconfig

backend/.eslintignore

backend/.eslintrc.json

backend/.prettierignore

backend/.prettierrc.json

backend/jest.config.json

backend/package-lock.json

backend/package.json

backend/src/index.spec.ts

backend/src/index.ts

backend/tsconfig.json

oetzi_game/package-lock.json