dev: NixOS 25.11 매뉴얼 로컬 사본 추가

nixpkgs nixos-25.11 브랜치의 nixos/doc/manual/ 디렉토리를 sparse clone으로
가져와 ~/obsidian/dev/nixos-manual/에 복사. _index.md에 구조/갱신 방법 정리.

오프라인 참조 + AI 에이전트 컨텍스트용. sandbox-tokyo 같은 NixOS 노드 운영 시
빠른 참조로 사용.

dev/nixos-manual/administration/declarative-containers.section.md

@@ -0,0 +1,53 @@
+# Declarative Container Specification {#sec-declarative-containers}
+
+You can also specify containers and their configuration in the host's
+`configuration.nix`. For example, the following specifies that there
+shall be a container named `database` running PostgreSQL:
+
+```nix
+{
+  containers.database = {
+    config =
+      { config, pkgs, ... }:
+      {
+        services.postgresql.enable = true;
+        services.postgresql.package = pkgs.postgresql_14;
+      };
+  };
+}
+```
+
+If you run `nixos-rebuild switch`, the container will be built. If the
+container was already running, it will be updated in place, without
+rebooting. The container can be configured to start automatically by
+setting `containers.database.autoStart = true` in its configuration.
+
+By default, declarative containers share the network namespace of the
+host, meaning that they can listen on (privileged) ports. However, they
+cannot change the network configuration. You can give a container its
+own network as follows:
+
+```nix
+{
+  containers.database = {
+    privateNetwork = true;
+    hostAddress = "192.168.100.10";
+    localAddress = "192.168.100.11";
+  };
+}
+```
+
+This gives the container a private virtual Ethernet interface with IP
+address `192.168.100.11`, which is hooked up to a virtual Ethernet
+interface on the host with IP address `192.168.100.10`. (See the next
+section for details on container networking.)
+
+To disable the container, just remove it from `configuration.nix` and
+run `nixos-rebuild
+  switch`. Note that this will not delete the root directory of the
+container in `/var/lib/nixos-containers`. Containers can be destroyed using
+the imperative method: `nixos-container destroy foo`.
+
+Declarative containers can be started and stopped using the
+corresponding systemd service, e.g.
+`systemctl start container@database`.