feat: switch to hostname crate for full hostname resolution

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/meta_plugin/hostname.rs

@@ -1,4 +1,3 @@
-use gethostname::gethostname;
 use crate::meta_plugin::MetaPlugin;
 
 #[derive(Debug, Clone, Default)]
@@ -49,8 +48,13 @@ impl HostnameMetaPlugin {
     }
     
     fn get_hostname(&self) -> String {
-        match gethostname().into_string() {
-            Ok(hostname) => hostname,
+        match hostname::get() {
+            Ok(hostname_os) => {
+                match hostname_os.into_string() {
+                    Ok(hostname) => hostname,
+                    Err(_) => "unknown".to_string(),
+                }
+            }
             Err(_) => "unknown".to_string(),
         }
     }