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.

vitest.config.ts

@@ -2,6 +2,6 @@ import { defineConfig } from 'vitest/config';
 
 export default defineConfig({
   test: {
-    include: ['src/**/*.test.ts', 'setup/**/*.test.ts'],
+    include: ['src/**/*.test.ts', 'setup/**/*.test.ts', 'skills-engine/**/*.test.ts'],
   },
 });