fix: Full diagnostic sweep — bugs, dead code, unused imports, docs accuracy

Code fixes:
- seasons/watchOrder: Remove dead ternary (both branches identical)
- mirror.helper: Remove redundant ternary (both branches identical)
- topAnimeRankings: Fix JSDoc (day/week/month, not top/newest)
- apiRoutes: Fix proxy domain validation (exact match, not includes)
- apiRoutes: Fix proxy .m3u8 check (pathname, not hostname)
- pagination: Fix totalItems calculation (was overestimating)
- server.js: Remove dead has404File variable
- server.js: Remove duplicate /api/cache/stats route
- server.js: Remove unused getCacheStats import

Unused imports removed:
- animeInfo: URLS from dataUrl.js
- episodeList: headers from header.config.js
- episodeListAjax: axios
- trending: URLS from dataUrl.js
- trendingSidebar: URLS from dataUrl.js
- upcomingAnime: parseListItems
- watchPage: URLS, BASE_URL from dataUrl.js

Docs fixes:
- README: 33->38 endpoints, 24->28 controllers, 26->28 extractors
- README: Cache TTL 5min->per-endpoint, Timeout 15s->30s
- docs/index.md: 33->38 endpoints
- architecture.md: LRU cache strategy, remove stale cookie-parser
- agents: compression version, extractor/controller counts
- agents: domain typo, stale CORS dep, version badge

server.js

@@ -25,7 +25,6 @@ import crypto from "crypto";
 import { fileURLToPath } from "url";
 import { dirname } from "path";
 import { createApiRoutes } from "./src/routes/apiRoutes.js";
-import { getCacheStats } from "./src/helper/cache.helper.js";
 import { addCreatorInfo } from "./src/middleware/creatorInfo.js";
 
 dotenv.config();
@@ -39,7 +38,6 @@ const PORT = process.env.PORT || 4444;
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
 const publicDir = path.join(process.cwd(), "public");
-const has404File = fs.existsSync(path.join(publicDir, "404.html"));
 const allowedOrigins = process.env.ALLOWED_ORIGINS?.split(",");
 
 // ---- FEATURE: Response compression ----
@@ -188,11 +186,6 @@ app.use((req, res, next) => {
   next();
 });
 
-// ---- FEATURE: Cache stats endpoint ----
-app.get("/api/cache/stats", (req, res) => {
-  res.json({ success: true, results: getCacheStats() });
-});
-
 // ---- FEATURE: Creator info middleware (injects attribution into all responses) ----
 app.use(addCreatorInfo);