support bot, bots: paginate chat scan (#6935)

* bots: document APIGetChats command and CRApiChats response

* bots: regenerate API docs and TypeScript types

* simplex-chat-nodejs: add apiGetChats

* support bot: avoid OOM on large databases

apiListGroups / apiListContacts return every record in one response and
overflow V8's string allocation on large DBs. Replace list-then-find-by-id
patterns with apiGetChat(type, id, 0) lookups, and the one genuine scan
(refreshAllCards) with paginated apiGetChats, count=1000.

* support bot: update test assertions to match current message text

* bots: simplify PaginationByTime, expose only PTLast

* simplex-chat-nodejs: bump types and nodejs versions

packages/simplex-chat-nodejs/src/api.ts

@@ -764,6 +764,25 @@ export class ChatApi {
     throw new ChatCommandError("error listing groups", r)
   }
 
+  /**
+   * Get chat previews (paginated).
+   * Network usage: no.
+   *
+   * Prefer this over apiListContacts / apiListGroups for any scan: those
+   * methods load every record into memory in a single response and will fail
+   * on large databases.
+   */
+  async apiGetChats(
+    userId: number,
+    pagination: T.PaginationByTime,
+    query: T.ChatListQuery = {type: "filters", favorite: false, unread: false},
+    pendingConnections = false,
+  ): Promise<T.AChat[]> {
+    const r = await this.sendChatCmd(CC.APIGetChats.cmdString({userId, pendingConnections, pagination, query}))
+    if (r.type === "apiChats") return r.chats
+    throw new ChatCommandError("error getting chats", r)
+  }
+
   /**
    * Delete chat.
    * Network usage: background.