feat(core): rebrand to @lossless.zone/objectstorage

- Rename from @lossless.zone/s3container to @lossless.zone/objectstorage
- Replace @push.rocks/smarts3 with @push.rocks/smartstorage
- Change env var prefix from S3_ to OBJST_
- Rename S3Container class to ObjectStorageContainer
- Update web component prefix from s3c- to objst-
- Update UI labels, CLI flags, documentation, and Docker config

ts_web/elements/shared/index.ts

@@ -0,0 +1,2 @@
+export * from './css.js';
+export * from './objst-sectionheading.js';