fix and update

apps/frontend/lib/api.ts

@@ -1769,9 +1769,8 @@ export async function checkAppUpdate(platform: AppReleasePlatform, versionCode:
 }
 
 export function buildAppReleaseDownloadUrl(platform: AppReleasePlatform, releaseId?: string) {
-  const base = getApiUrl().replace(/\/$/, '');
   const slug = platform.toLowerCase();
-  return releaseId ? `${base}/releases/download/${slug}/${releaseId}` : `${base}/releases/download/${slug}`;
+  return releaseId ? `/downloads/${slug}/${releaseId}` : `/downloads/${slug}`;
 }
 
 export async function fetchAdminAppReleases(token: string, platform?: AppReleasePlatform) {

apps/frontend/lib/proxy-release-download.ts

@@ -0,0 +1,55 @@
+import type { NextRequest } from 'next/server';
+
+function resolveServerApiBase(request: NextRequest) {
+  const internal = process.env.INTERNAL_API_URL?.replace(/\/$/, '');
+  if (internal) return internal;
+  return `${request.nextUrl.origin}/idp-api`;
+}
+
+const PASSTHROUGH_HEADERS = [
+  'content-type',
+  'content-length',
+  'content-disposition',
+  'x-release-version',
+  'x-release-version-code',
+  'x-release-sha256',
+  'cache-control'
+] as const;
+
+export async function proxyReleaseDownload(
+  request: NextRequest,
+  platform: 'android' | 'windows',
+  releaseId?: string
+) {
+  const apiBase = resolveServerApiBase(request);
+  const path = releaseId
+    ? `/releases/download/${platform}/${releaseId}`
+    : `/releases/download/${platform}`;
+
+  const upstream = await fetch(`${apiBase}${path}`, {
+    method: 'GET',
+    cache: 'no-store'
+  });
+
+  if (!upstream.ok) {
+    const message = await upstream.text().catch(() => 'Файл релиза недоступен');
+    return new Response(message, {
+      status: upstream.status,
+      headers: {
+        'Content-Type': 'text/plain; charset=utf-8',
+        'Cache-Control': 'no-store'
+      }
+    });
+  }
+
+  const headers = new Headers();
+  for (const key of PASSTHROUGH_HEADERS) {
+    const value = upstream.headers.get(key);
+    if (value) headers.set(key, value);
+  }
+
+  return new Response(upstream.body, {
+    status: upstream.status,
+    headers
+  });
+}