feat: add /devices endpoint

db.py

@@ -0,0 +1,12 @@
+from dto import Device
+
+
+def get_all_devices(cur) -> list[Device]:
+    res = cur.execute("SELECT access_key, type, name FROM devices")
+    devices_from_db = res.fetchall()
+
+    devices = []
+    for item in devices_from_db:
+        devices.append(Device.convert(item))
+    return devices
+