Apply ruff's safe autofixes.
The changes are mechanical and behaviour-preserving. Issues fixed:
- F401: remove unused imports.
- F841: drop unused local variables and assignments, including discarded
await/return values, unused "except ... as e" bindings, and unused
"with ... as name" targets.
- F541: remove the f prefix from f-strings that contain no placeholders.
- E711: compare against None with "is"/"is not" instead of "=="/"!=".
- E712: test truthiness directly instead of comparing to True.
- E713: use "x not in y" instead of "not x in y".
- E714: use "is not" instead of "not ... is".
- E731: convert lambdas bound to a name into def statements.
- W291/W293: trim trailing whitespace on touched lines.
Await OEM sensor, NTP, retry, and firmware-update operations that otherwise returned or discarded coroutine objects. Return the initialized energy manager for FAPM systems and update stale utility entry points to use asynchronous Command factories.
Since it turns out we already incurred lxml dependency, use lxml etree instead of xml and mitigate risky xml features beyond blocking the word '!entity'