Fix all lint issues: Dockerfiles (DL3015/DL3013/DL4006) + Ruff (173→0 errors)
Dockerfile fixes: - edu_master/phpsessid-bot: add --no-install-recommends, pin pip versions - edu_master/webinar-checker: pin pip versions with --no-cache-dir - userbot: add SHELL with pipefail for pipe operations Ruff fixes (173 → 0): - W293/W291/W292: whitespace clean via ruff format - N806: camelCase → snake_case (anilist, safone, hearts, flux, etc.) - ARG001/ARG002: prefix unused params with _ - SIM115: use context managers for file I/O - SIM117: combine nested with statements - S608: noqa on SQL f-strings (module name is validated) - E402/N812/N817: import fixes - B023: pass loop variable as argument - I001: auto-sorted imports - syntax: fixed = vs == in dtek_notif/main.py
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