Merge branch 'diplomy' into 'devel'

README.md

bin/init-data-dir

constraints.txt

db/db.ddl

db/upgrade-20250117.sql

doc/export-pro-web.md

doc/score-snapshot.md

etc/config.py.example

mo/contests.py

mo/db.py

mo/email.py

mo/ext/json_walker.py

mo/jobs/__init__.py

mo/jobs/certs.py

mo/jobs/notify.py

mo/jobs/protocols.py

mo/jobs/score.py

mo/rights.py

mo/score.py

mo/submit.py