feat: enable subnet routes for ryu

Signed-off-by: uttarayan21 <email@uttarayan.me>

nixos/ryu/services/tailscale.nix

@@ -2,6 +2,8 @@
   services = {
     tailscale = {
       enable = true;
+      useRoutingFeatures = true;
+      extraUpFlags = ["--advertise-routes=192.168.0.0/24"];
     };
   };
 }