refactor(logs): name every logger after its module, and hold it there

25 literal names covered 34 modules. plex/client.py, plex/stream.py,
plex/subtitles.py, plex/sync.py and two Plex route modules all called themselves
`siftlode.plex`; downloads/pipeline.py called itself `siftlode.worker`;
routes/channels.py called itself `siftlode.api`. The `logger` column is in every
stored row so E22.6's console can filter on it, and so an operator can pin a level
to one part of the system — neither works when six modules share a name.

`logs.get_logger(__name__)` derives it: app/plex/sync.py -> siftlode.plex.sync.
One name per module, and it cannot drift from the file it sits in.
tests/test_logger_names.py pins the derivation, that everything stays under the
one `siftlode` tree the handler and the tests attach to, and that no module
hand-rolls a name again unless the line says why (`# logger-name-ok: <why>`).
Two do: get_logger's own call, and `siftlode.http`, which is named for the traffic
it carries rather than the module it lives in — it replaced uvicorn's access log
and is what an operator pins when they want request lines and nothing else.

app/scheduler.py called its logger `logger`; every other module calls it `log`.

ruff gains LOG, G, T20, TRY400, TRY401 and S112. Four findings cleared with them:
worker.py logged `str(exc)[:120]` where the traceback was the whole question, and
three prints/f-strings that are deliberate now say so on the line. S110 and BLE001
stay off until S3 — 23 handlers are outstanding and each is a judgement about one
of them; enabling the rules first would just mean 23 blanket noqas.

backend/app/routes/plex/_shared.py

@@ -1,14 +1,13 @@
 """Shared helpers, serializers and constants for the plex route package."""
 
-import logging
-
 from fastapi import HTTPException
 from sqlalchemy.orm import Session
 
+from app import logs
 from app.models import PlexItem
 from app.plex.lookups import by_rating_key
 
-log = logging.getLogger("siftlode.plex")
+log = logs.get_logger(__name__)
 
 
 def item_or_404(db: Session, rating_key: str) -> PlexItem:

backend/app/routes/plex/people.py

@@ -1,6 +1,5 @@
 """Plex people: cast/crew filter-chip cards + a single person's filmography page."""
 
-import logging
 import threading
 import time
 
@@ -8,6 +7,7 @@ from fastapi import APIRouter, BackgroundTasks, Depends
 from sqlalchemy import func, or_, select
 from sqlalchemy.orm import Session
 
+from app import logs
 from app.auth import current_user
 from app.db import SessionLocal, get_db
 from app.models import (
@@ -22,7 +22,7 @@ from app.plex.cards import movie_card, show_card
 from app.plex.query import content_libs, split_csv
 
 router = APIRouter(prefix="/api/plex", tags=["plex"])
-log = logging.getLogger("siftlode.plex")
+log = logs.get_logger(__name__)
 
 
 def _resolve_known_for(