refactor: reorganize server modules

- Moved each individual service definition into a dedicated `services/`
  directory under every server module (e.g.
`modules/servers/bragi/services/`).
- Updated the corresponding `default.nix` files to import the renamed
  service modules from the new location.
- Applied the same changes across all server modules, ensuring
  the API and import paths remain consistent.

modules/servers/tyr/services/wallos.nix

@@ -0,0 +1,38 @@
+{
+  virtualisation.oci-containers.containers.wallos = {
+    image = "docker.io/bellamy/wallos:latest";
+    autoStart = true;
+    ports = [
+      "8282:80/tcp"
+    ];
+    labels = {
+      "io.containers.autoupdate" = "registry";
+    };
+    volumes = [
+      "/var/lib/wallos/db:/var/www/html/db"
+      "/var/lib/wallos/logos:/var/www/html/images/uploads/logos"
+    ];
+  };
+
+  services.restic.backups = {
+    local.paths = ["/var/lib/wallos"];
+    server.paths = ["/var/lib/wallos"];
+  };
+
+  services.traefik.dynamicConfigOptions.http = {
+    services.wallos.loadBalancer.servers = [
+      {
+        url = "http://localhost:8282";
+      }
+    ];
+
+    routers.wallos = {
+      rule = "Host(`wallos.home.cronyakatsuki.xyz`)";
+      tls = {
+        certResolver = "porkbun";
+      };
+      service = "wallos";
+      entrypoints = "websecure";
+    };
+  };
+}