Add D-Bus session and system services

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/recipes/system/redbear-sessiond/source/src/manager.rs

@@ -0,0 +1,113 @@
+use zbus::{
+    fdo,
+    interface,
+    object_server::SignalEmitter,
+    zvariant::OwnedObjectPath,
+};
+
+#[derive(Clone, Debug)]
+pub struct LoginManager {
+    session_id: String,
+    session_path: OwnedObjectPath,
+    seat_id: String,
+    seat_path: OwnedObjectPath,
+}
+
+impl LoginManager {
+    pub fn new(session_path: OwnedObjectPath, seat_path: OwnedObjectPath) -> Self {
+        Self {
+            session_id: String::from("c1"),
+            session_path,
+            seat_id: String::from("seat0"),
+            seat_path,
+        }
+    }
+}
+
+#[interface(name = "org.freedesktop.login1.Manager")]
+impl LoginManager {
+    fn get_session(&self, id: &str) -> fdo::Result<OwnedObjectPath> {
+        if id == self.session_id {
+            return Ok(self.session_path.clone());
+        }
+
+        Err(fdo::Error::Failed(format!("unknown login1 session '{id}'")))
+    }
+
+    fn list_sessions(&self) -> fdo::Result<Vec<(String, u32, String, String, OwnedObjectPath)>> {
+        Ok(vec![(
+            self.session_id.clone(),
+            0,
+            String::from("root"),
+            self.seat_id.clone(),
+            self.session_path.clone(),
+        )])
+    }
+
+    fn get_seat(&self, id: &str) -> fdo::Result<OwnedObjectPath> {
+        if id == self.seat_id {
+            return Ok(self.seat_path.clone());
+        }
+
+        Err(fdo::Error::Failed(format!("unknown login1 seat '{id}'")))
+    }
+
+    #[zbus(property(emits_changed_signal = "const"), name = "IdleHint")]
+    fn idle_hint(&self) -> bool {
+        false
+    }
+
+    #[zbus(property(emits_changed_signal = "const"), name = "IdleSinceHint")]
+    fn idle_since_hint(&self) -> u64 {
+        0
+    }
+
+    #[zbus(property(emits_changed_signal = "const"), name = "IdleSinceHintMonotonic")]
+    fn idle_since_hint_monotonic(&self) -> u64 {
+        0
+    }
+
+    #[zbus(property(emits_changed_signal = "const"), name = "BlockInhibited")]
+    fn block_inhibited(&self) -> String {
+        String::new()
+    }
+
+    #[zbus(property(emits_changed_signal = "const"), name = "DelayInhibited")]
+    fn delay_inhibited(&self) -> String {
+        String::new()
+    }
+
+    #[zbus(property(emits_changed_signal = "const"), name = "InhibitDelayMaxUSec")]
+    fn inhibit_delay_max_usec(&self) -> u64 {
+        0
+    }
+
+    #[zbus(property(emits_changed_signal = "const"), name = "HandleLidSwitch")]
+    fn handle_lid_switch(&self) -> String {
+        String::from("ignore")
+    }
+
+    #[zbus(property(emits_changed_signal = "const"), name = "HandlePowerKey")]
+    fn handle_power_key(&self) -> String {
+        String::from("poweroff")
+    }
+
+    #[zbus(property(emits_changed_signal = "const"), name = "PreparingForSleep")]
+    fn preparing_for_sleep(&self) -> bool {
+        false
+    }
+
+    #[zbus(property(emits_changed_signal = "const"), name = "PreparingForShutdown")]
+    fn preparing_for_shutdown(&self) -> bool {
+        false
+    }
+
+    #[zbus(signal, name = "PrepareForSleep")]
+    async fn prepare_for_sleep(signal_emitter: &SignalEmitter<'_>, before: bool) -> zbus::Result<()>;
+
+    #[zbus(signal, name = "PrepareForShutdown")]
+    async fn prepare_for_shutdown(
+        signal_emitter: &SignalEmitter<'_>,
+        before: bool,
+    ) -> zbus::Result<()>;
+}