- The default deb.debian.org Cloudflare CDN throttled to ~150 kB/s from
this network and repeatedly dropped the gcc-12/cpp-12 fetch, failing
the image build twice. Switch apt to mirror.yandex.ru and add
Acquire retry/timeout options so the system-dependency layer
(OCRmyPDF, Tesseract rus+eng, Ghostscript, qpdf) builds reliably.
- Copy pyproject.toml, README.md, alembic.ini and the app/scripts
packages before "pip install -e ." so hatchling's editable build can
validate the readme and packages (previously failed with
"Readme file does not exist: README.md").
- Drop README.md from .dockerignore so the build context includes it.
- Ignore local preview launch config (frontend/.claude, .claude/launch.json).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>