chore: bump min python version to 3.12; bump ty; update actions versions

chore: deprecate python 3.9 (about to reach end of life), run 3.14-dev on ci

chore: bring all CI configs up to date; run ty

ci: update ruff config

readme: do not ignore .org files (excludes README.org by accident)

general: cleanup ci files/switch to hatch backend/format

ci: switch building & release to uv, update ruff and mypy configs

general: migrate appdirs -> platformdirs

general: set min python version to 3.9 and cleanup CI files

modules.youtube: add mode --all to dump all videos + minor cleanup

ruff: suggest using from __future__ import annotations, switch List -> list, Dict -> dict, Optional -> | where possible

ruff: update config

ci: update ci files according to pymplate

modules.auto: allow using properties in the formatting string

ci: fix mypy