FINAL FIX: Simplify Paddle API call to use default checkout

FINAL DEBUG: Inspect Paddle response object

DEBUG: Expose Paddle API error in flash message

FINAL FIX: Force update all files including requirements.txt

FIX: Explicitly new users to 'free' plan on registration

FIX: Explicitly new users to 'free' plan on registration

Fix: Add upgrade UI to index.html

Add startup.sh to run migrations on free tier

Implement user accounts, login, and basic quota system

Fix Dockerfile: save as plain text

Fix .gitignore and remove venv from repository

Initial commit of DocuText app