feat(telegram): improve DM topics support (#30579) (thanks @kesor)

src/auto-reply/reply/inbound-meta.ts

@@ -107,6 +107,7 @@ export function buildInboundUserContextPrefix(ctx: TemplateContext): string {
     group_channel: safeTrim(ctx.GroupChannel),
     group_space: safeTrim(ctx.GroupSpace),
     thread_label: safeTrim(ctx.ThreadLabel),
+    topic_id: ctx.MessageThreadId != null ? String(ctx.MessageThreadId) : undefined,
     is_forum: ctx.IsForum === true ? true : undefined,
     is_group_chat: !isDirect ? true : undefined,
     was_mentioned: ctx.WasMentioned === true ? true : undefined,

src/auto-reply/templating.ts

@@ -139,6 +139,8 @@ export type MsgContext = {
   MessageThreadId?: string | number;
   /** Telegram forum supergroup marker. */
   IsForum?: boolean;
+  /** Warning: DM has topics enabled but this message is not in a topic. */
+  TopicRequiredButMissing?: boolean;
   /**
    * Originating channel for reply routing.
    * When set, replies should be routed back to this provider