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/device_map.rs

@@ -0,0 +1,47 @@
+use std::{collections::HashMap, fs::File, io};
+
+#[derive(Clone, Debug)]
+pub struct DeviceMap {
+    static_paths: HashMap<(u32, u32), String>,
+}
+
+impl DeviceMap {
+    pub fn new() -> Self {
+        let static_paths = HashMap::from([
+            ((226, 0), String::from("/scheme/drm/card0")),
+            ((226, 1), String::from("/scheme/drm/card1")),
+            ((13, 64), String::from("/dev/input/event0")),
+            ((13, 65), String::from("/dev/input/event1")),
+            ((13, 66), String::from("/dev/input/event2")),
+            ((13, 67), String::from("/dev/input/event3")),
+            ((29, 0), String::from("/dev/fb0")),
+            ((1, 1), String::from("/scheme/null")),
+            ((1, 5), String::from("/scheme/zero")),
+            ((1, 8), String::from("/scheme/rand")),
+        ]);
+
+        Self { static_paths }
+    }
+
+    pub fn resolve(&self, major: u32, minor: u32) -> Option<String> {
+        if let Some(path) = self.static_paths.get(&(major, minor)) {
+            return Some(path.clone());
+        }
+
+        match (major, minor) {
+            (13, minor) if minor >= 68 => Some(format!("/dev/input/event{}", minor - 64)),
+            _ => None,
+        }
+    }
+
+    pub fn open_device(&self, major: u32, minor: u32) -> io::Result<File> {
+        let Some(path) = self.resolve(major, minor) else {
+            return Err(io::Error::new(
+                io::ErrorKind::NotFound,
+                format!("no Red Bear device mapping for major={major}, minor={minor}"),
+            ));
+        };
+
+        File::open(path)
+    }
+}