Add deployment blueprints and reviewed launch recipes

src/routes/api/deployments/preview/+server.ts

@@ -0,0 +1,12 @@
+import { json } from '@sveltejs/kit';
+import { previewCreation } from '$lib/server/fleet/create.js';
+
+export async function POST({ request }: { request: Request }) {
+    try {
+        const body = await request.json();
+        if (!body || typeof body !== 'object' || Array.isArray(body)) throw new Error('Provide a launch selection.');
+        return json(previewCreation(body));
+    } catch (err) {
+        return json({ error: (err as Error).message }, { status: 400 });
+    }
+}