fix: OUT messages no longer create unread status + handle Telegram read receipts

Only inbound (IN) messages determine hasUnread in getContacts(). Telegram
read_business_message events are now parsed and processed to auto-mark
contacts as read for the entire team.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/server/graphql/schema.ts

@@ -426,7 +426,7 @@ async function getContacts(auth: AuthContext | null) {
       include: {
         note: { select: { content: true } },
         messages: {
-          ...(messageWhere ? { where: messageWhere } : {}),
+          where: { direction: "IN", ...(messageWhere ?? {}) },
           select: { content: true, channel: true, occurredAt: true },
           orderBy: { occurredAt: "desc" as const },
           take: 1,