[REQUEST] Manual import trigger or configurable polling interval

[omriza]

First off, thanks for building MediaManager! As a fresh home media owner and the premise of having everything in one place instead of juggling multiple *arr apps was very compelling to me.

Is your feature request related to a problem? Please describe.
When I download something for immediate watching, I have to wait up to 15 minutes for the scheduled import job to pick it up. The polling interval works fine for most cases, but sometimes I just want to grab something and watch it right away.
It's somewhat related to #380 (or at least could help set expectations regarding the job schedule).

Describe the solution you'd like
A way to trigger an import immediately. This could be:

• A "Scan Now" or "Import Now" button in the UI
• An API endpoint that can be called externally (so qBittorrent's "run command on completion" could trigger it)
• Or even just making the polling interval configurable in config.toml

Any of these would solve the problem.

Describe alternatives you've considered
I looked into whether qBittorrent could notify MediaManager on completion, but there's no webhook endpoint to call. I also considered just waiting for the 15-minute cycle, which works fine 90% of the time - it's really just the "I want to watch this now" scenario where it would be nice to have more control.

Additional context
The current implementation in scheduler.py has the interval hard-coded:

every_15_minutes_trigger = CronTrigger(minute="*/15", hour="*")

Even just exposing this as a config option would help - I could set it to 5 minutes or even 1 minute if I'm willing to accept the extra load.

[mschumacher69]

Or, just configure it to auto scan at torrent download completion, the torrent state is visible to MM through the api, no need for qB's run command to trigger it externally.