Rename blueprints to Collections and add Operations tab

Fixes #46

src/routes/api/blueprints/+server.ts

@@ -6,7 +6,7 @@ export function GET() { return json({ blueprints: listBlueprints() }); }
 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 blueprint name and a launch recipe.');
+        if (!body || typeof body !== 'object' || Array.isArray(body)) throw new Error('Provide a collection name and a launch recipe.');
         return json({ blueprint: saveBlueprint(body) }, { status: 201 });
     } catch (err) {
         return json({ error: (err as Error).message }, { status: 400 });