clan-cli: Make clan flakes create discover templates from inputs. Add clan flakes list command

templates/default.nix

@@ -0,0 +1,39 @@
+{ ... }:
+{
+  disko = {
+    single-disk = {
+      description = "A simple ext4 disk with a single partition";
+      path = ./disk/single-disk;
+    };
+  };
+
+  machine = {
+    flash-installer = {
+      description = "Initialize a new flash-installer machine";
+      path = ./clan/machineTemplates/machines/flash-installer;
+    };
+    new-machine = {
+      description = "Initialize a new machine";
+      path = ./clan/machineTemplates/machines/new-machine;
+    };
+  };
+
+  clan = {
+    default = {
+      description = "Initialize a new clan flake";
+      path = ./clan/new-clan;
+    };
+    minimal = {
+      description = "for clans managed via (G)UI";
+      path = ./clan/minimal;
+    };
+    flake-parts = {
+      description = "Flake-parts";
+      path = ./clan/flake-parts;
+    };
+    minimal-flake-parts = {
+      description = "Minimal flake-parts clan template";
+      path = ./clan/minimal-flake-parts;
+    };
+  };
+}