release: 0.1.5 — hide IM adapter UI (out of product scope)

Per product-package design docs, IM integration (Lark / Feishu /
Telegram) is not a Heicode surface. Hide UI without ripping out
plumbing — keep AdapterSettings.tsx + adapterStore + types in the
source tree so re-enabling is a one-flag flip.

- Settings.tsx: drop the "IM 接入" tab button (`'adapters'` route
  still resolves internally if someone forces it, but no nav).
- NewTaskModal.tsx: remove the IM notification channel pickers
  (Feishu / Telegram checkboxes + "no channel configured" warning).
  Existing task `notification` config is preserved on edit; it's
  just no longer mutable from this UI.
- Unused imports (useEffect, useAdapterStore) cleaned to satisfy
  TS strict mode.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cc-haha/desktop/package.json

@@ -1,7 +1,7 @@
 {
   "name": "heicode-desktop",
   "private": true,
-  "version": "0.1.4",
+  "version": "0.1.5",
   "type": "module",
   "scripts": {
     "dev": "vite",