send-config: store json+pdf + sftp + best-effort email

api: add python-multipart for UploadFile/Form

chore: dedupe python-dotenv

fix: add python-dotenv for api

fix: add python-dotenv for api

fix: docker FastAPI deploy

fix: add api runtime deps

deploy: real pdf-trainer-demo API

demo(A): local pdf storage + PUT/GET /api/pdf

fix: dockerize api space (deps + uvicorn entrypoint)

deps: add paramiko for SFTP pdf fetch

SFTP: serve PDFs + store configs in /inserio

fix: add google api client dependencies

integrate real backend api

fix: include requirements.txt for docker build