feat(gui): TOTP tab with QR code modal + revoke (feature-gated)

gui/src/bus.rs

@@ -88,6 +88,24 @@ impl Daemon {
     }
 }
 
+#[cfg(feature = "totp")]
+impl Daemon {
+    pub async fn enroll_totp(
+        &self,
+        user: &str,
+    ) -> zbus::Result<authforge_common::types::TotpEnrollment> {
+        self.proxy.call("EnrollTotp", &(user,)).await
+    }
+
+    pub async fn is_totp_enrolled(&self, user: &str) -> zbus::Result<bool> {
+        self.proxy.call("IsTotpEnrolled", &(user,)).await
+    }
+
+    pub async fn revoke_totp(&self, user: &str) -> zbus::Result<bool> {
+        self.proxy.call("RevokeTotp", &(user,)).await
+    }
+}
+
 #[allow(dead_code)] // wired through keys_page.rs in Task 4.
 pub(crate) fn current_user() -> String {
     std::env::var("USER").unwrap_or_else(|_| "unknown".into())