feat(adapters): RSS and PT site adapters ported from MoviePilot v3 + mocks (W1-3b)

- rss: port of MP RssHelper._parse_impl/get_rss_link semantics with safe
  XML (entities off, DTD/ENTITY rejected, size/item caps), ETag/Last-Modified,
  backoff + Retry-After, circuit breaker with manual reset, passkey redaction,
  overlap-window GUID+digest dedupe
- sites/spider: TS port of MP SiteSpider (indexer schema, search URL builder,
  field DSL, filters, Jinja templates via nunjucks, login-page detection);
  audiences definition hand-written as JSON; raw category id preserved;
  shared per-site token bucket
- sites/mteam: port of MP MTorrentSpider (params, result mapping, promo
  factors, genDlToken flow) without embedding the API key in enclosures;
  business code/message checks
- testkit: mock RSS server, mock NexusPHP site, mock M-Team API
- docs: W1-3b migration mapping appended to porting ledger

Co-Authored-By: Claude Fable 5.1 <[email protected]>

packages/adapters/package.json

@@ -10,7 +10,13 @@
     "typecheck": "tsc -p tsconfig.json",
     "test": "vitest run"
   },
+  "dependencies": {
+    "cheerio": "^1.2.0",
+    "fast-xml-parser": "^5.11.1",
+    "nunjucks": "^3.2.4"
+  },
   "devDependencies": {
+    "@types/nunjucks": "^3.2.6",
     "@umt/testkit": "workspace:*"
   }
 }