ci: add Gitea Actions tests workflow (check + vitest + build)

Tourne sur push main/dev et pull_request. Runner node:22-bullseye.
Pas de deploy automatique : l'upload FTP reste manuel.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/test.yml

@@ -0,0 +1,26 @@
+name: Tests
+on:
+  push:
+    branches: [main, dev]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    container:
+      image: node:22-bullseye
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: npm ci --no-audit --no-fund
+
+      - name: Astro check (types + lint hints)
+        run: npm run check
+
+      - name: Vitest
+        run: npm test
+
+      - name: Astro build (vérifie que le build prod passe)
+        run: npm run build