docs: Complete documentation overhaul with live API data + bug fixes

Documentation (5800+ lines total):
- endpoints.md: All 43 endpoints documented with real response examples,
  param tables, response patterns, common workflows, error formats
- streaming.md: Complete streaming workflow guide with HLS.js/Plyr/Video.js
  integration, M3U8 proxy explanation, error handling
- examples.md: Working code examples in cURL, JS fetch, Python requests,
  Node.js axios, HTML/JS player integration (2240 lines)
- architecture.md: Full project structure, request flow diagrams, caching
  strategy, mirror failover, security, deployment notes
- index.md: Overview with quick start, feature highlights, endpoint tables

Bug fixes:
- episodeList.extractor: Parse JSON response before Cheerio (was passing
  raw JSON string as HTML, causing escaped quotes in IDs)
- episodeListAjax.extractor: Same JSON parsing fix
- topAnimeRankings.controller: Fix JSDoc and default sort from top to day
  (actual values are day/week/month, not top/newest)
- apiRoutes.js: Fix OpenAPI spec sort description for top-rankings

Tests: 35/35 passing

src/routes/apiRoutes.js

@@ -661,7 +661,7 @@ app.get("/api/openapi", (req, res) => {
       "/az-list/{letter}": { get: { summary: "A-Z listing", tags: ["Discovery"] } },
       "/suggestions": { get: { summary: "Anime suggestions", tags: ["Search"] } },
       "/upcoming": { get: { summary: "Upcoming anime", tags: ["Discovery"] } },
-      "/top-rankings": { get: { summary: "Top anime rankings (top/newest)", tags: ["Rankings"] } },
+      "/top-rankings": { get: { summary: "Top anime rankings (day/week/month)", tags: ["Rankings"] } },
       "/recently-updated": { get: { summary: "Recently updated (all/dub/sub tabs)", tags: ["Releases"] } },
       "/completed": { get: { summary: "Completed anime series", tags: ["Rankings"] } },
     },