Feat: page Play — backgroundColor, playLink, play-icon + fix slug jouer

- Renommage dossier content 3_play → 3_jouer (slug /jouer)
- Champ backgroundColor (code-editor) dans game.yml + exposé en API
- playLinks simplifié en champ url simple → playLink dans l'API
- Variable CSS --background-color sur la section .play
- Bouton "Jouer" avec icône play-icon (SVG data URI dans buttons.css)
- Plugin sylvainjule/code-editor ajouté via composer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

site/plugins/code-editor/src/node/patchVuePrismEditor.mjs

@@ -0,0 +1,38 @@
+import { existsSync, readFileSync, writeFileSync } from "fs";
+import chalk from "chalk";
+import consola from "consola";
+
+const srcPath = "node_modules/vue-prism-editor/dist/prismeditor.esm.js";
+
+async function main() {
+  consola.start("Vue Prism Editor patcher");
+
+  if (!existsSync(srcPath)) {
+    consola.error(
+      `couldn't find ${chalk.cyan(srcPath)}, did you run ${chalk.green(
+        "npm install"
+      )}?`
+    );
+    return;
+  }
+
+  const source = readFileSync(srcPath, "utf8");
+
+  if (!source.includes("Vue.extend")) {
+    consola.success("already patched");
+    return;
+  }
+
+  consola.info("patching the source component...");
+
+  let output = source
+    .replace(/^import Vue from 'vue';/, "")
+    .replace("/*#__PURE__*/Vue.extend(", "")
+    .replace(/\}\)(;\s+export)/, "}$1");
+
+  writeFileSync(srcPath, output, "utf8");
+
+  consola.success("successfully patched");
+}
+
+main().catch((err) => consola.error(err));