feat(parser): site category prefix, RSS embedded description and subtitle titles (ID-2)

Strip [电视剧]/[动漫]/[音乐]… prefixes into parsed.category instead of titleCn,
split RSS-embedded site descriptions into the subtitle, take the first Chinese
name of the subtitle as titleCn and the rest as altTitles, and stop reading
'Travis - 12 Memories' as episode 12. PARSER_VERSION 2.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/mapping/test/convert.test.ts

@@ -3,6 +3,7 @@ import {
   DEFAULT_TEMPLATES,
   evaluateCandidate,
   type IdentityCandidate,
+  PARSER_VERSION,
   parseRelease,
   planOrganize,
   resolveIdentity,
@@ -237,7 +238,7 @@ describe("SiteRelease ↔ source_release", () => {
     expect(C.SourceReleaseCreate.safeParse(create).success).toBe(true);
     expect(create).toMatchObject({ siteId: U(40), infohashV1: "a".repeat(40), infohashV2: null, categoryRaw: "401" });
     expect(JSON.stringify(create)).not.toContain("download.php");
-    expect(create.parserVersion).toBe("1");
+    expect(create.parserVersion).toBe(String(PARSER_VERSION));
   });
 
   it("source_release 行还原为 SiteReleaseLike(下载入口除外)", () => {