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/thor/conduit.nix

@@ -1,39 +0,0 @@
-{config, ...}: {
-  services.matrix-conduit = {
-    enable = true;
-    settings = {
-      global = {
-        server_name = "cronyakatsuki.xyz";
-        database_backend = "rocksdb";
-        allow_registration = true;
-        allow_check_for_updates = true;
-      };
-    };
-  };
-
-  systemd.services.conduit.serviceConfig = {
-    EnvironmentFile = ["${config.age.secrets.conduit.path}"];
-  };
-
-  services.traefik.dynamicConfigOptions.http = {
-    services.conduit.loadBalancer.servers = [
-      {
-        url = "http://localhost:6167";
-      }
-    ];
-
-    routers.conduit = {
-      rule = "Host(`matrix.cronyakatsuki.xyz`)";
-      tls = {
-        certResolver = "porkbun";
-      };
-      service = "conduit";
-      entrypoints = "websecure";
-    };
-  };
-
-  services.restic.backups = {
-    local.paths = ["/var/lib/matrix-conduit"];
-    server.paths = ["/var/lib/matrix-conduit"];
-  };
-}