fix: update ITs to use consolidated init.sql, remove dead code

- All 7 ClickHouse integration tests now load init.sql via shared
  ClickHouseTestHelper instead of deleted V1-V11 migration files
- Remove unused useScope exports (setApp, setRoute, setExchange, clearScope)
- Remove unused CSS classes (monoCell, punchcardStack)
- Update ui/README.md DS version to v0.1.28

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

ui/README.md

@@ -1,6 +1,6 @@
 # Cameleer3 UI
 
-React SPA built with [@cameleer/design-system](https://gitea.siegeln.net/cameleer/design-system) v0.1.26, TanStack Query, and Zustand.
+React SPA built with [@cameleer/design-system](https://gitea.siegeln.net/cameleer/design-system) v0.1.28, TanStack Query, and Zustand.
 
 ## Development