release: ship v1.8.0 with knowledge, recording and settings sync

Knowledge documents move between desktop, phone and web as source text and
are indexed on each device; desktop recordings upload to the shared storage
and any recording plays from the history card; language, theme, auto-polish
and the active command follow the phone. Document text survives a missing
embedding model so it can be indexed later.

Bumps the product version to 1.8.0 (Android/iOS build 1080000).

packages/api-client/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@d3ro/api-client",
-  "version": "1.7.0",
+  "version": "1.8.0",
   "private": true,
   "description": "D3RO Voice API 클라이언트 — Supabase 래퍼 (web/desktop/mobile 공유)",
   "license": "MIT",