fix: Bug fixes from full API diagnostic sweep — all 33 endpoints now 200 OK

- Fix /api/watch 500: correct URL path format (slug/ep-N -> slug/ep-N)
- Fix /api/info: accept both ?id= and ?slug= query params
- Fix /api/status/airing 500: map short status names (ongoing/airing/completed) to correct slugs
- Fix /api/top-rankings: correct selectors (#top-anime .scaff.side.items a.item) + extract rank from rankN class
- Fix /api/completed: correct selectors (section.top-table[data-name='completed'] a.item)
- Fix /api/recently-updated: correct selectors (#recent-update .ani.items .item) + client-side tab filtering
- Fix parseListItem: detect self-as-anchor (<a> elements) + fallback slug extraction
- Fix category extractor: add status name mapping (ongoing->currently-airing, etc.)
- Add /api/cache/stats endpoint for LRU cache diagnostics
- 33 endpoints verified: 0 errors, 0 timeouts

src/controllers/animeInfo.controller.js

@@ -41,16 +41,17 @@ import { getCache, setCache, TTL } from "../helper/cache.helper.js";
  */
 const getAnimeInfo = async (req, res, next) => {
   try {
-    const { id } = req.query;
-    if (!id) {
-      return res.status(400).json({ success: false, message: "Anime slug is required" });
+    const { id, slug } = req.query;
+    const animeSlug = id || slug;
+    if (!animeSlug) {
+      return res.status(400).json({ success: false, message: "Anime slug is required (?id= or ?slug=)" });
     }
-    const cacheKey = `anime_${id}`;
+    const cacheKey = `anime_${animeSlug}`;
     const cached = getCache(cacheKey);
     if (cached) {
       return res.json({ success: true, results: cached });
     }
-    const data = await extractAnimeInfo(id);
+    const data = await extractAnimeInfo(animeSlug);
     setCache(cacheKey, data, TTL.info);
     res.json({ success: true, results: data });
   } catch (error) {