fix: replace ts-node with tsx for worker scripts

TypeScript 7's CommonJS export no longer populates ts.sys, which
ts-node's config loader depends on, breaking `npm run worker` with
a TypeError. tsx (esbuild-based) doesn't rely on that API and
natively resolves tsconfig.json path aliases, so tsconfig-paths is
also no longer needed.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -18,7 +18,7 @@ Interface web de téléchargement de vidéos via [yt-dlp](https://github.com/yt-
 | Framework | Next.js 16 (App Router) |
 | Base de données | MariaDB 11 via Prisma 7 |
 | Frontend | React 19, TypeScript |
-| Worker | Node.js (ts-node) |
+| Worker | Node.js (tsx) |
 | Conteneur (dev) | Docker Compose |
 
 ## Prérequis