dev(narugo): add min interval limit for video source

[codecov[bot]]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (0567806) 56.36% compared to head (568db8a) 56.25%.

Files	Patch %	Lines
waifuc/source/video.py	33.33%	10 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #41 +/- ## ========================================== - Coverage 56.36% 56.25% -0.12% ========================================== Files 50 50 Lines 2583 2592 +9 ========================================== + Hits 1456 1458 +2 - Misses 1127 1134 +7 ``` | [Flag](https://app.codecov.io/gh/deepghs/waifuc/pull/41/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepghs) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/deepghs/waifuc/pull/41/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepghs) | `56.25% <33.33%> (-0.12%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepghs#carryforward-flags-in-the-pull-request-comment) to find out more.

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