fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/astro/dist/runtime/server/endpoint.d.ts

@@ -0,0 +1,7 @@
+import type { Logger } from '../../core/logger/core.js';
+import type { APIRoute } from '../../types/public/common.js';
+import type { APIContext } from '../../types/public/context.js';
+/** Renders an endpoint request to completion, returning the body. */
+export declare function renderEndpoint(mod: {
+    [method: string]: APIRoute;
+}, context: APIContext, isPrerendered: boolean, logger: Logger): Promise<Response>;