chore: lint and format entire codebase

Run ruff check --fix: remove unused imports (F401), fix f-strings
without placeholders (F541), remove unused variables (F841), fix
duplicate dict key (F601).

Run isort --profile black: normalize import ordering across all files.

Run ruff format: apply consistent formatting (black-compatible) to
all 58 Python files.

3 intentional E402 remain (imports after require_yaml() must execute
after yaml is available).

scripts/scraper/targets/retropie_targets_scraper.py

@@ -4,6 +4,7 @@ Source: https://github.com/RetroPie/RetroPie-Setup/tree/master/scriptmodules/lib
 Parses rp_module_id and rp_module_flags from each scriptmodule to determine
 which platforms each core supports.
 """
+
 from __future__ import annotations
 
 import argparse