This PR replaces the APScheduler lib with the Taskiq task queuing lib.
# why
APScheduler doesn't support FastAPI's DI in tasks, this makes them quite
cumbersome to read and write since DB, Repositories and Services all
need to be instanciated manually.
Moreover, Taskiq makes it easier to start background tasks from FastAPI
requests. This enables MM to move to a more event-based architecture.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* App now uses an orchestrated async startup/shutdown and runs
background scheduling via a database-backed task queue; startup enqueues
pre-load/import/update tasks.
* **Bug Fixes**
* Improved torrent client handling with clearer conflict messages and
guidance for manual resolution.
* Enhanced logging around season, episode and metadata update
operations; minor regex/behaviour formatting preserved.
* **Chores**
* Updated dependencies to support the new task queue and connection
pooling.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
this mostly either removes unused parameters, prefixes them with an
underscore or uses the @override decorator to tell the linter, that that
method comes from a superclass and can't be changed
this mostly adds a timeout=60 to all requests
this does mainly wants a timeout to all requests functions, since when
left out they hang infinitly.
I added a timeout of 60s, which is probably way too high, but since
before this there was none, I guess it's an improvement?
