refactor: split satellite and launch provider modules

server/providers/space.js

@@ -0,0 +1,3 @@
+/** Satellite and launch-feed middleware for Node development servers. */
+export { celestrakProxy } from './space/celestrak.js';
+export { rocketLaunchesProxy, LL2_CACHE_TTL_MS, launchLibraryRequestHeaders } from './space/launch-library.js';