feat: add Telegram Topics (forum mode) support

- buildJid() constructs tg:{chatId}:{threadId} for topic messages
- parseJid() extracts chatId + threadId from JID for outbound routing
- /chatid command shows thread ID in forum topics
- sendMessage and setTyping pass message_thread_id when present
- All message handlers (text, photo, voice, media) use thread-aware JIDs

Allows each forum topic to be registered as an independent Nanoclaw group.

src/routing.test.ts

@@ -22,6 +22,16 @@ describe('JID ownership patterns', () => {
     const jid = '12345678@s.whatsapp.net';
     expect(jid.endsWith('@s.whatsapp.net')).toBe(true);
   });
+
+  it('Telegram JID: starts with tg:', () => {
+    const jid = 'tg:123456789';
+    expect(jid.startsWith('tg:')).toBe(true);
+  });
+
+  it('Telegram group JID: starts with tg: and has negative ID', () => {
+    const jid = 'tg:-1001234567890';
+    expect(jid.startsWith('tg:')).toBe(true);
+  });
 });
 
 // --- getAvailableGroups ---
@@ -167,4 +177,103 @@ describe('getAvailableGroups', () => {
     const groups = getAvailableGroups();
     expect(groups).toHaveLength(0);
   });
+
+  it('includes Telegram chat JIDs', () => {
+    storeChatMetadata(
+      'tg:100200300',
+      '2024-01-01T00:00:01.000Z',
+      'Telegram Chat',
+      'telegram',
+      true,
+    );
+    storeChatMetadata(
+      'user@s.whatsapp.net',
+      '2024-01-01T00:00:02.000Z',
+      'User DM',
+      'whatsapp',
+      false,
+    );
+
+    const groups = getAvailableGroups();
+    expect(groups).toHaveLength(1);
+    expect(groups[0].jid).toBe('tg:100200300');
+  });
+
+  it('returns Telegram group JIDs with negative IDs', () => {
+    storeChatMetadata(
+      'tg:-1001234567890',
+      '2024-01-01T00:00:01.000Z',
+      'TG Group',
+      'telegram',
+      true,
+    );
+
+    const groups = getAvailableGroups();
+    expect(groups).toHaveLength(1);
+    expect(groups[0].jid).toBe('tg:-1001234567890');
+    expect(groups[0].name).toBe('TG Group');
+  });
+
+  it('marks registered Telegram chats correctly', () => {
+    storeChatMetadata(
+      'tg:100200300',
+      '2024-01-01T00:00:01.000Z',
+      'TG Registered',
+      'telegram',
+      true,
+    );
+    storeChatMetadata(
+      'tg:999999',
+      '2024-01-01T00:00:02.000Z',
+      'TG Unregistered',
+      'telegram',
+      true,
+    );
+
+    _setRegisteredGroups({
+      'tg:100200300': {
+        name: 'TG Registered',
+        folder: 'tg-registered',
+        trigger: '@Andy',
+        added_at: '2024-01-01T00:00:00.000Z',
+      },
+    });
+
+    const groups = getAvailableGroups();
+    const tgReg = groups.find((g) => g.jid === 'tg:100200300');
+    const tgUnreg = groups.find((g) => g.jid === 'tg:999999');
+
+    expect(tgReg?.isRegistered).toBe(true);
+    expect(tgUnreg?.isRegistered).toBe(false);
+  });
+
+  it('mixes WhatsApp and Telegram chats ordered by activity', () => {
+    storeChatMetadata(
+      'wa@g.us',
+      '2024-01-01T00:00:01.000Z',
+      'WhatsApp',
+      'whatsapp',
+      true,
+    );
+    storeChatMetadata(
+      'tg:100',
+      '2024-01-01T00:00:03.000Z',
+      'Telegram',
+      'telegram',
+      true,
+    );
+    storeChatMetadata(
+      'wa2@g.us',
+      '2024-01-01T00:00:02.000Z',
+      'WhatsApp 2',
+      'whatsapp',
+      true,
+    );
+
+    const groups = getAvailableGroups();
+    expect(groups).toHaveLength(3);
+    expect(groups[0].jid).toBe('tg:100');
+    expect(groups[1].jid).toBe('wa2@g.us');
+    expect(groups[2].jid).toBe('wa@g.us');
+  });
 });