refactor: 移除 ttyd 扩展的“用户凭据”功能

src/extensions/manager.rs

@@ -230,13 +230,6 @@ impl ExtensionManager {
                     "-W".to_string(),            // Writable (allow input)
                 ];
 
-                // Add credential if set (still useful for additional security layer)
-                if let Some(ref cred) = c.credential {
-                    if !cred.is_empty() {
-                        args.extend(["-c".to_string(), cred.clone()]);
-                    }
-                }
-
                 // Add shell as last argument
                 args.push(c.shell.clone());
                 Ok(args)

src/extensions/types.rs

@@ -102,9 +102,6 @@ pub struct TtydConfig {
     pub port: u16,
     /// Shell to execute
     pub shell: String,
-    /// Credential in format "user:password" (optional)
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub credential: Option<String>,
 }
 
 impl Default for TtydConfig {
@@ -113,7 +110,6 @@ impl Default for TtydConfig {
             enabled: false,
             port: 7681,
             shell: "/bin/bash".to_string(),
-            credential: None,
         }
     }
 }