config: support clawdis.json path for rebranding

- Add CONFIG_PATH_CLAWDIS (~/.clawdis/clawdis.json) as preferred path
- Keep CONFIG_PATH_LEGACY (~/.warelay/warelay.json) for backward compatibility
- Update loadConfig() to check clawdis.json first, fallback to warelay.json
- Fix TypeScript type error in extractMentionedJids (null handling)

Part of the warelay → clawdis rebranding effort.

src/web/inbound.ts

@@ -359,7 +359,7 @@ function extractMentionedJids(
   const message = unwrapMessage(rawMessage);
   if (!message) return undefined;
 
-  const candidates: (string[] | undefined)[] = [
+  const candidates: (string[] | null | undefined)[] = [
     message.extendedTextMessage?.contextInfo?.mentionedJid,
     message.extendedTextMessage?.contextInfo?.quotedMessage?.extendedTextMessage
       ?.contextInfo?.mentionedJid,