refactor: consolidate runtime helpers

src/available-groups.ts

@@ -0,0 +1,19 @@
+import type { AvailableGroup } from './agent-runner.js';
+import { getAllChats } from './db.js';
+import type { RegisteredGroup } from './types.js';
+
+export function listAvailableGroups(
+  registeredGroups: Record<string, RegisteredGroup>,
+): AvailableGroup[] {
+  const chats = getAllChats();
+  const registeredJids = new Set(Object.keys(registeredGroups));
+
+  return chats
+    .filter((chat) => chat.jid !== '__group_sync__' && chat.is_group)
+    .map((chat) => ({
+      jid: chat.jid,
+      name: chat.name,
+      lastActivity: chat.last_message_time,
+      isRegistered: registeredJids.has(chat.jid),
+    }));
+}