feat: local releases for offline/CORS-free flasher

flasher/index.html

@@ -207,6 +207,7 @@
       <nav style="justify-content:center;gap:1rem;">
         <a href="#" @click.prevent="view='releases'; selectedRelease=null; selectedAsset=null">Список релизов</a>
         <a href="#" @click.prevent="view='console'">&#128187; Консоль</a>
+        <a href="./configurator.html">&#9881; Конфигуратор</a>
         <a href="https://git2.ua1zbe.ru/ua1zbe/meshcore-simple-sensor" target="_blank">Git2.ua1zbe.ru</a>
       </nav>
     </footer>
@@ -253,11 +254,21 @@
         async loadReleases() {
           this.loading = true;
           this.error = '';
-          // If same origin, no CORS needed
+          // Try local releases.json first (no CORS), then API, then CORS proxy
+          try {
+            const localRes = await fetch('./releases.json');
+            if (localRes.ok) {
+              const data = await localRes.json();
+              this.releases = Array.isArray(data) ? data.reverse() : [];
+              this.loading = false;
+              return;
+            }
+          } catch {}
           if (OWN_ORIGIN === API_ORIGIN) {
-            return this._fetchDirect();
+            await this._fetchDirect();
+            this.loading = false;
+            return;
           }
-          // Try direct, fallback to CORS proxy
           try {
             await this._fetchDirect();
           } catch {