DM Detection not working

**Describe the bug**

DMs to the bot are being processed like any other message.

**To Reproduce**

DM the bot

**Expected behavior**

It should just respond with "Hello!" for now.

**Additional context**

- [ ] Move DM detection to the top of the message received flow
- [ ] Fix DM detection

Start by locating the bot's message-received flow and the existing DM detection, then reproduce the issue by sending the bot a direct message. Done means DMs receive only "Hello!" instead of being processed like other messages, with the detection handled at the intended point in the flow.

Written by the indexing model from the issue text.