Enhanced Internal Listener Runtime

[Eeshu-Yadav]

Replace the placeholder run_internal_listener implementation with full functionality to accept and process internal connections.

Scope

• Implement actual connection acceptance in internal listeners
• Integrate with existing filter chain processing
• Add proper internal listener lifecycle management
• Register listeners with the connection factory

Current State

async fn run_internal_listener() -> Error {
    // For now, internal listeners just wait for updates
    loop { /* only config updates */ }
}

Dependencies

• Blocked by: Internal Connection Factory Implementation #105