android: add group channel invite and admin management baseline

android/CHANGELOG.md

@@ -404,3 +404,16 @@
 - Added process-wide audio focus coordinator to enforce single active audio source:
   - attachment player pauses when another source starts,
   - recording requests focus and stops competing playback.
+
+### Step 67 - Group/channel management baseline in Chat List
+- Extended chat API/repository layer with management operations:
+  - create group/channel,
+  - discover + join/leave chats,
+  - invite link create/regenerate,
+  - members/bans listing and admin actions (add/remove/ban/unban/promote/demote).
+- Added domain models for discover/member/ban items and repository mappings.
+- Added in-app management panel in `ChatListScreen` (FAB toggle) for:
+  - creating group/channel,
+  - joining discovered chats,
+  - loading chat members/bans by chat id,
+  - executing admin/member visibility actions from one place.