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/configuration/profiles/all-hardware.section.md

@@ -0,0 +1,11 @@
+# All Hardware {#sec-profile-all-hardware}
+
+Enables all hardware supported by NixOS: i.e., all firmware is included, and
+all devices from which one may boot are enabled in the initrd. Its primary
+use is in the NixOS installation CDs.
+
+The enabled kernel modules include support for SATA and PATA, SCSI
+(partially), USB, Firewire (untested), Virtio (QEMU, KVM, etc.), VMware, and
+Hyper-V. Additionally, [](#opt-hardware.enableAllFirmware) is
+enabled, and the firmware for the ZyDAS ZD1211 chipset is specifically
+installed.