console: add /download/[platform] endpoint

packages/console/app/src/routes/download/[platform].ts

@@ -0,0 +1,20 @@
+import { APIEvent } from "@solidjs/start";
+
+const assetNames: Record<string, string> = {
+  "darwin-aarch64-dmg": "opencode-desktop-darwin-aarch64.dmg",
+  "windows-x64-nsis": "opencode-desktop-windows-x64.exe",
+  "linux-x64-deb": "opencode-desktop-linux-amd64.deb",
+  "linux-x64-rpm": "opencode-desktop-linux-x86_64.rpm"
+}
+
+export async function GET({ params: { platform } }: APIEvent) {
+  const assetName = assetNames[platform];
+  if(!assetName) return new Response("Not Found", { status: 404 });
+
+  return await fetch(`https://github.com/sst/opencode/releases/latest/download/${assetName}`, {
+    cf: {
+      cacheTtl: 60 * 60 * 24,
+      cacheEverything: true,
+    }
+  } as any)
+}