Move marked.min.js into its own vendor/ folder (AI)

Third-party code is now kept separate from the app's own js/ modules.
Updated js/config.js's MARKED_URL to the new sibling-directory path
(../vendor/marked.min.js) and the README's project structure diagram
accordingly.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AXSVPS3UmmASiiprPfcnUd

README.md

@@ -58,7 +58,6 @@ from the library — not something an embedding page needs to bring along.
 │       ├── toc.css             # Auto-generated table of contents
 │       └── author-profile.css  # Author profile card (avatar, bio, social links)
 ├── js/
-│   ├── marked.min.js   # marked.js (local copy, loaded as a global)
 │   ├── config.js       # BASE_URL, MARKED_URL (all via import.meta.url)
 │   ├── frontmatter.js  # parseFrontmatter() — pure YAML-front parser
 │   ├── templates.js    # loadTemplates(), templates cache
@@ -68,6 +67,8 @@ from the library — not something an embedding page needs to bring along.
 │   ├── i18n.js         # t(), loadStrings(), getLocale() — UI string lookup
 │   ├── views.js        # loadArticleList, loadArticle, loadAuthorView, loadCategoryView, loadSearch
 │   └── router.js       # Hash router and app entry point
+├── vendor/
+│   └── marked.min.js   # marked.js (local copy, loaded as a global) — the only 3rd-party code
 ├── strings/
 │   ├── en.json         # UI strings (default/fallback locale) — see "Translations" below
 │   ├── cs.json         # Czech translation

js/config.js

@@ -5,5 +5,6 @@
 // here, one level up from this file (e.g. https://example.com/).
 export const BASE_URL = new URL('../', import.meta.url).href;
 
-// Path to the marked.js vendor script (bundled alongside this file)
-export const MARKED_URL = new URL('marked.min.js', import.meta.url).href;
+// Path to the marked.js vendor script — lives in vendor/, a sibling of this
+// file's own js/ directory, not alongside the app's own modules.
+export const MARKED_URL = new URL('../vendor/marked.min.js', import.meta.url).href;