M5: Windows client moderation UI; add C ABI getters for account list, user mute/deafen, channel topic

PROGRESS.md

@@ -20,8 +20,10 @@ up instantly. Newest status at the top.
   `--username`/`--password` for account auth and `--self-mute`/`--self-deafen`. Docs updated:
   `docs/protocol.md` (envelope tags for `ServerMuteRequest`/`ListAccountsResult`, `User.server_deafened`,
   `GenericResult` usage), `docs/security.md` (BLAKE2b channel passwords, `bans` schema).
-  `ctest --preset m1-dev` — **18/18 green**. Still to do: DRED/audio-quality polish and Windows
-  admin/moderation UI.
+  `ctest --preset m1-dev` — **18/18 green**. Windows WinForms UI now exposes all M5 operations:
+  channel CRUD with full per-channel Opus audio config, user moderation (kick/ban/move/server
+  mute/server deafen/set permissions), and server account management. `dotnet test` of the
+  Windows solution passes. Still to do: DRED/audio-quality polish.
 - **Done:** **Fixed a *second* silent-playback bug — the playout clock free-ran and drifted off
   the stream** (2026-06-17, reported live: both `vccli` and the Windows client showed `talking=1/0`
   correctly on VAD/PTT, mic + screen-share were recognized by peers, but nothing was audible).
@@ -499,10 +501,9 @@ DLLs remain — verified via `objdump -p`).
 broadcast `ChannelEvent::CREATED` from a moved-from `entry.proto` after
 `channels_[id] = std::move(entry)`. Fixed by building the event before moving into the map.
 
-**Still to do:**
-- DRED/audio-quality polish.
-- Windows admin/moderation UI in the WinForms client.
-- macOS/iOS Swift client (carried from M4).
+ **Still to do:**
+ - DRED/audio-quality polish.
+ - macOS/iOS Swift client (carried from M4).
 
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