fix(discord): land proxy/media/reaction/model-picker regressions

Reimplements core Discord fixes from #25277 #25523 #25575 #25588 #25731 with expanded tests.

- thread proxy-aware fetch into inbound attachment/sticker downloads
- fetch /gateway/bot via proxy dispatcher before ws connect
- wire statusReactions emojis/timing overrides into controller
- compact model-picker custom_id keys with backward-compatible parsing

Co-authored-by: openperf <openperf@users.noreply.github.com>
Co-authored-by: chilu18 <chilu18@users.noreply.github.com>
Co-authored-by: Yipsh <Yipsh@users.noreply.github.com>
Co-authored-by: lbo728 <lbo728@users.noreply.github.com>
Co-authored-by: s1korrrr <s1korrrr@users.noreply.github.com>

src/discord/monitor/message-handler.preflight.ts

@@ -733,5 +733,6 @@ export async function preflightDiscordMessage(
     canDetectMention,
     historyEntry,
     threadBindings: params.threadBindings,
+    discordRestFetch: params.discordRestFetch,
   };
 }