CI : workflow validate.yml, manifeste ci.required:true, package.json avec scripts verify

- Ajout .gitea/workflows/validate.yml (runs-on: ci-node22, test de contrat)
- Ajout package.json avec scripts test/check/build/verify
- Ajout ci.required:true dans app.json

package.json

@@ -0,0 +1,11 @@
+{
+  "name": "portail-santinova",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "test": "node test/portal-contract.test.js",
+    "check": "echo 'No TypeScript — skip'",
+    "build": "echo 'Static site — no build step'",
+    "verify": "pnpm check && pnpm test && pnpm build"
+  }
+}