Add YSK Comics

[vetleledaal]

Closes #11703

Used Copilot for fetchSearchManga(), fetchChapterList(), and description in DTOs. Not sure if explicit status = SManga.UNKNOWN makes sense. I used a black background for the icon to mimic the site, might be too little contrast.

Have not combined MangaPopularRaw, MangaLatestRaw, and MangaSearchRaw to keep complexity low and decrease coupling.

Checklist:

• [x] Updated extVersionCode value in build.gradle for individual extensions
• [x] Updated overrideVersionCode or baseVersionCode as needed for all multisrc extensions
• [x] Referenced all related issues in the PR body (e.g. "Closes #xyz")
• [x] Added the isNsfw = true flag in build.gradle when appropriate
• [x] Have not changed source names
• [x] Have explicitly kept the id if a source's name or language were changed
• [x] Have tested the modifications by compiling and running the extension through Android Studio
• [x] Have removed web_hi_res_512.png when adding a new extension