dev(narugo): add video extract support for web source (WIP)

[codecov[bot]]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (1e2b25d) 56.49% compared to head (74b2cad) 56.36%.

Files	Patch %	Lines
waifuc/source/web.py	30.00%	21 Missing :warning:
waifuc/source/video.py	33.33%	2 Missing :warning:
waifuc/utils/video.py	0.00%	2 Missing :warning:
waifuc/utils/filetype.py	85.71%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #39 +/- ## ========================================== - Coverage 56.49% 56.36% -0.14% ========================================== Files 48 50 +2 Lines 2554 2583 +29 ========================================== + Hits 1443 1456 +13 - Misses 1111 1127 +16 ``` | [Flag](https://app.codecov.io/gh/deepghs/waifuc/pull/39/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/39/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepghs) | `56.36% <39.53%> (-0.14%)` | :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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