feat(baoyu-url-to-markdown): add URL-specific parser layer for X/Twitter and archive.ph

- New parsers/ module with pluggable rule system for site-specific HTML extraction
- X status parser: extract tweet text, media, quotes, author from data-testid elements
- X article parser: extract long-form article content with inline media
- archive.ph parser: restore original URL and prefer #CONTENT container
- Improved slug generation with stop words and content-aware slugs
- Output path uses subdirectory structure (domain/slug/slug.md)
- Fix: preserve anchor elements containing media in legacy converter
- Fix: smarter title deduplication in markdown document builder

skills/baoyu-url-to-markdown/scripts/parsers/rules/index.ts

@@ -0,0 +1,10 @@
+import { archivePhRuleParser } from "./archive-ph.js";
+import { xArticleRuleParser } from "./x-article.js";
+import { xStatusRuleParser } from "./x-status.js";
+import type { UrlRuleParser } from "../types.js";
+
+export const URL_RULE_PARSERS: UrlRuleParser[] = [
+  archivePhRuleParser,
+  xArticleRuleParser,
+  xStatusRuleParser,
+];