Add Makefile, package.json, and initial configuration for VitePress and Slidev integration

- Introduced a Makefile for streamlined commands related to building, running, and managing presentations.
- Created package.json to define project metadata, dependencies, and scripts for development and testing.
- Added .gitignore entries to exclude build artifacts and temporary files from version control.
- Included playwright.config.mjs for end-to-end testing setup with Playwright.
- Added README.md for project documentation, outlining setup instructions and development guidelines.

tests/sync-tmp-repo.test.mjs

@@ -0,0 +1,55 @@
+/**
+ * Intégration : sync-portal sur un dépôt minimal (TALKS_ROOT) sans toucher au vrai portail.
+ */
+import { test } from 'node:test'
+import assert from 'node:assert'
+import fs from 'node:fs'
+import os from 'node:os'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import { spawnSync } from 'node:child_process'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+const repoRoot = path.resolve(__dirname, '..')
+
+test('sync sur dépôt temporaire (TALKS_ROOT)', () => {
+  const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'talks-tmp-'))
+
+  fs.mkdirSync(path.join(tmp, 'portal'), { recursive: true })
+  fs.writeFileSync(
+    path.join(tmp, 'portal', 'index.md'),
+    ['---', 'layout: doc', '---', '', '<!-- FEATURED_START -->', '<!-- FEATURED_END -->', ''].join('\n'),
+  )
+
+  const hello = path.join(tmp, 'slides', 'hello-world')
+  fs.mkdirSync(hello, { recursive: true })
+  fs.writeFileSync(
+    path.join(hello, 'meta.json'),
+    JSON.stringify({
+      title: 'Hello World',
+      description: 'Test tmp',
+      order: 1,
+      featured: true,
+    }),
+  )
+  fs.writeFileSync(path.join(hello, 'slides.md'), '---\n---\n\n# Slide\n')
+
+  const r = spawnSync(process.execPath, [path.join(repoRoot, 'tools', 'sync-portal.mjs')], {
+    cwd: repoRoot,
+    env: { ...process.env, TALKS_ROOT: tmp },
+    encoding: 'utf8',
+  })
+  assert.strictEqual(r.status, 0, r.stderr || r.stdout)
+
+  const detail = path.join(tmp, 'portal', 'presentations', 'hello-world', 'index.md')
+  assert.ok(fs.existsSync(detail), 'fiche générée')
+  const body = fs.readFileSync(detail, 'utf8')
+  assert.ok(body.includes('Hello World'))
+  assert.ok(body.includes('<QrEncode path="/slides/hello-world/1"'))
+
+  const list = path.join(tmp, 'portal', 'presentations', 'index.md')
+  assert.ok(fs.readFileSync(list, 'utf8').includes('Hello World'))
+
+  const featured = fs.readFileSync(path.join(tmp, 'portal', 'index.md'), 'utf8')
+  assert.ok(featured.includes('talk-card'))
+})