feat(release): ship the current feature set as 1.2.0

Version 1.1.0 was published on 2026-09-15, so its tag is closed. Every commit
since then, the update-feed rework, dictionary import and export, the extra
push transports, and entitlement gating, needs its own immutable version.

Product version, Android version code, iOS build number, and all package and
store surfaces move to 1.2.0 / 1020001, with Korean and English store notes for
the new version code. The download centers read that version and its release
date from one place instead of repeating them inline.

apps/admin/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@d3ro/admin",
-  "version": "1.1.0",
+  "version": "1.2.0",
   "private": true,
   "description": "D3RO Voice Admin CRM — SaaS 관리 도구",
   "scripts": {