feature: Add mDNS support to access web C2 at ducklogger.local

[Itsmmdoha]

Currently, accessing the web C2 requires knowing the device's IP address. In AP mode it's 192.168.4.1, but in Wi-Fi station mode the IP is dynamic and unknown.

Feature

Add mDNS support so the web interface is accessible at http://ducklogger.local in both AP and station modes.

Implementation

• Advertise mDNS hostname ducklogger in both access_point.py and wifi.py
• Enable mDNS on the web server started in api.py