Bump to 0.4.1, fix release script to match legacy commit prefix and auto-bump versions

- Bumps server/Cargo.toml and frontend/package.json to 0.4.1
- Release script now auto-bumps both version files when run
- Changelog generation matches both "storkit:" and "story-kit:" prefixes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -4007,7 +4007,7 @@ checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
 
 [[package]]
 name = "storkit"
-version = "0.3.1"
+version = "0.4.1"
 dependencies = [
  "async-stream",
  "async-trait",