[hoanle0126]

Summary

Fixes #33

Addresses the two Markdown translation issues reported in #33 that caused Docusaurus MDX compilation and link parsing to fail for fa, ja, and other locales:

1. Stray code fences (```) and section labels (Body: / بخش body:) in translated Markdown:

   • When the model wraps either the frontmatter or the entire response in a ```markdown / ```yaml block, stripping only the preamble before the opening --- delimiter left either:
     • a closing ``` fence (and optional translated Body: label) immediately after the frontmatter --- (as seen in fa/docusaurus-plugin-content-docs/current/Capabilities.md), or
     • an unclosed/duplicate trailing ``` fence on the final line of the file (present in 12 translated .md files across ar, de, fa, fr, ja, ru, and ta).
   • Updated sanitizeMarkdown and validateFrontmatter in src/translate.ts (plus TRANSLATION_INSTRUCTIONS in src/constants.ts) to strip and reject stray post-frontmatter fences/labels and unbalanced trailing code fences, and cleaned up the 12 affected Markdown files.

2. Bare URLs glued directly to non-ASCII text / fullwidth punctuation in CJK translations:

   • In languages without word spaces (ja, zh, ko), bare http:// or https:// URLs followed immediately by non-ASCII characters or fullwidth punctuation (（, ）) without a space caused GFM autolink (remark-gfm) to swallow the trailing text (and any subsequent [ from a Markdown link), either failing MDX compilation (Can't parse URL ... with base unspecified:// as in ja/.../BoilerplateProjects.md) or producing corrupted URLs.
   • Updated sanitizeMarkdown and validateFrontmatter to ensure bare URLs outside code blocks, inline code, and [text](url) / <url> links are separated by a space before trailing non-ASCII characters, and fixed the 6 affected files across ja, ko, and zh.

Verification

• Added unit tests in test/frontmatter.test.ts covering post-frontmatter fences/labels, outer trailing fences, bare URLs followed by non-ASCII text, and repository-wide validation across all 18 locales (npm test).