§22 S2: release v0.41.0 — create & navigate a second collection (@S2)

Minor, non-breaking: named collections via .collection.yaml, create-collection
endpoint, collection-scoped serve/propose, and the /p/<project>/ collection
directory. Completes acceptance @S2 (C3.6). 478 backend + 26 frontend green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "rfc-app-frontend",
   "private": true,
-  "version": "0.40.0",
+  "version": "0.41.0",
   "type": "module",
   "scripts": {
     "dev": "vite",