v3.0.0

Server mode

• New role to operate as server #47, #60
• New -g {server,client}, --role {server,client} option
• New -n GAP_NAME, --name GAP_NAME option
• New ble-server.py script in examples

Client mode

• Add Feasycom BT826 characteristics to builtin list #107
• Performance fix for bleak 0.21+, add --write-with-response option #109
• Improved error message on port conflict #106
• Updated client example scripts (#60)
• Autoconnect with multiple devices in parallel #96

Internal

• Rewritten tests with pytest, include cases for server mode and tcp (#60)
• Modernized tools: pyproject.toml, hatch, uv and updated github actions CI #112