fix(annotations): fail-open when src/annotations is missing

src/pages/annotations-index.json.ts

@@ -112,7 +112,7 @@ export const GET: APIRoute = async () => {
     missingRoot = true;
     console.warn(`[annotations-index] Missing annotations root: ${ANNO_ROOT} (${e?.message || e})`);
     files = [];
-    errors.push({ file: "src/annotations", error: `Missing annotations root: ${e?.message || e}` });
+    // ✅ surtout PAS d'errors.push ici
   }
 
   for (const fp of files) {
@@ -183,6 +183,14 @@ export const GET: APIRoute = async () => {
     pg.paras = next;
   }
 
+  const warnings: Array<{ where: string; warning: string }> = [];
+  if (missingRoot) {
+    warnings.push({
+      where: "src/pages/annotations-index.json.ts",
+      warning: `Missing annotations root "${ANNO_ROOT}" (treated as empty).`,
+    });
+  }
+
   const out = {
     schema: 1,
     generatedAt: new Date().toISOString(),
@@ -192,6 +200,7 @@ export const GET: APIRoute = async () => {
       paras: Object.values(pages).reduce((n, p) => n + Object.keys(p.paras || {}).length, 0),
       errors: errors.length,
     },
+    warnings,
     errors,
   };