feat(weebs): add anime/manga info, whatanime, waifu endpoints

Ported from Shirokami-API scraper/weebs/*.js:
- /weebs/anime-info (jikan.moe anime search)
- /weebs/manga-info (jikan.moe manga search)
- /weebs/whatanime (trace.moe reverse image search)
- /weebs/sfw-waifu + /weebs/nsfw-waifu (waifu.pics)

Tested: anime-info (Naruto real data) + whatanime (real match). manga-info
+ waifu currently report upstream 504/DNS-down (jikan manga endpoint &
waifu.pics unreachable from VPS right now) - proxy logic verified via the
working anime/whatanime siblings.

src/application/mod.rs

@@ -5,3 +5,4 @@ pub mod komik;
 pub mod misc;
 pub mod proxy;
 pub mod stalk;
+pub mod weebs;