set world seed, add new models

systems/palatine-hill/docker/minecraft.nix

@@ -93,10 +93,11 @@ in
         CF_FILENAME_MATCHER = "1.11.2";
         USE_AIKAR_FLAGS = "false";
         USE_MEOWICE_FLAGS = "true";
-        DIFFICULTY = "hard";
+        DIFFICULTY = "peaceful";
         ENABLE_COMMAND_BLOCK = "true";
         INIT_MEMORY = "4G";
         MAX_MEMORY = "16G";
+        SEED = "-7146406535839057559";
       };
       extraOptions = defaultOptions;
       log-driver = "local";