Function handle_manual_tls 

pub fn handle_manual_tls(
    ctx: &mut TlsBuildContext,
    crypto_provider: &CryptoProvider,
    port: u16,
    sni_hostname: Option<String>,
    cert_path: &str,
    key_path: &str,
) -> Result<()>

Configures a manually provided TLS certificate and private key.

This function:

• Loads and validates the certificate and private key
• Registers the certificate for preloading
• Installs an SNI resolver (or fallback resolver) for the given port

Manual TLS always takes precedence over automatic TLS.