[feat] Integrated Dropbear SSH server (#3842)

* Add a menu item to start an ssh server

* Add blank login option

frontend/ui/elements/reader_menu_order.lua

@@ -52,6 +52,15 @@ local order = {
         "djvu_render_mode",
         "status_bar",
     },
+    network = {
+        "network_wifi",
+        "network_proxy",
+        "network_restore",
+        "network_info",
+        "network_before_wifi_action",
+        "----------------------------",
+        "ssh",
+    },
     tools = {
         "read_timer",
         "calibre_wireless_connection",