NOTE
Netty Server Startup: Initializing the Server Channel
Applying parent options/attributes and installing child-channel initialization logic before registration.
This is a historical learning note and may contain outdated or incomplete understanding.
Server-channel initialization applies parent-channel options/attributes and installs pipeline logic that will configure accepted child channels using childHandler, child options, and child attributes.
This is why ServerBootstrap distinguishes settings for the listening channel from settings for accepted connections.
Source helper names change across versions; preserve the parent-versus-child configuration model.