refactor(home): consolidate host home modules under home/hosts

home/hosts/README.md

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+# Host Home Modules
+
+This directory contains host-specific Home Manager entry modules.
+
+## Layout
+
+- `home/hosts/linux/*.nix`: Linux host home modules
+- `home/hosts/darwin/*.nix`: macOS host home modules
+
+## Conventions
+
+1. Each host output should reference only one file under `home/hosts/...`.
+2. Shared home module imports should be handled in the host file itself.
+   - Linux hosts usually import `../../linux/core.nix` or `../../linux/gui.nix`.
+   - Darwin hosts import `../../darwin`.
+3. Host-specific overrides (SSH keys, desktop toggles, host-local config links) live in the same
+   host file.

home/hosts/darwin/darwin-fern.nix

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+{ config, ... }:
+let
+  hostName = "fern";
+in
+{
+  imports = [ ../../darwin ];
+
+  programs.ssh.matchBlocks."github.com".identityFile =
+    "${config.home.homeDirectory}/.ssh/${hostName}";
+}

home/hosts/darwin/darwin-frieren.nix

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+{ config, ... }:
+let
+  hostName = "frieren";
+in
+{
+  imports = [ ../../darwin ];
+
+  programs.ssh.matchBlocks."github.com".identityFile =
+    "${config.home.homeDirectory}/.ssh/${hostName}";
+}

home/hosts/linux/12kingdoms-shoukei.nix

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+{ config, ... }:
+let
+  hostName = "shoukei"; # Define your hostname.
+  mkSymlink = config.lib.file.mkOutOfStoreSymlink;
+in
+{
+  imports = [ ../../linux/gui.nix ];
+
+  programs.ssh.matchBlocks."github.com".identityFile =
+    "${config.home.homeDirectory}/.ssh/${hostName}";
+
+  modules.desktop.gaming.enable = false;
+  modules.desktop.niri.enable = true;
+  modules.desktop.nvidia.enable = false;
+
+  xdg.configFile."niri/niri-hardware.kdl".source =
+    mkSymlink "${config.home.homeDirectory}/nix-config/hosts/12kingdoms-shoukei/niri-hardware.kdl";
+}

home/hosts/linux/idols-ai.nix

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+{ config, ... }:
+let
+  mkSymlink = config.lib.file.mkOutOfStoreSymlink;
+in
+{
+  imports = [ ../../linux/gui.nix ];
+
+  programs.ssh.matchBlocks."github.com".identityFile = "${config.home.homeDirectory}/.ssh/idols-ai";
+
+  modules.desktop.gaming.enable = true;
+  modules.desktop.niri.enable = true;
+  modules.desktop.nvidia.enable = true;
+
+  xdg.configFile."niri/niri-hardware.kdl".source =
+    mkSymlink "${config.home.homeDirectory}/nix-config/hosts/idols-ai/niri-hardware.kdl";
+}

home/hosts/linux/idols-aquamarine.nix

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+{
+  programs.gh.enable = true;
+  programs.git.enable = true;
+
+  programs.zellij.enable = true;
+  programs.bash.enable = true;
+  programs.nushell.enable = true;
+
+  programs.starship = {
+    enable = true;
+    enableBashIntegration = true;
+    enableNushellIntegration = true;
+  };
+  programs.neovim = {
+    enable = true;
+    viAlias = true;
+    vimAlias = true;
+  };
+
+  home.stateVersion = "25.11";
+}

home/hosts/linux/idols-kana.nix

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+{
+  imports = [ ./idols-aquamarine.nix ];
+}

home/hosts/linux/idols-ruby.nix

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+{
+  imports = [ ./idols-aquamarine.nix ];
+}

home/hosts/linux/k3s-prod-1-master-1.nix

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+{
+  imports = [ ../../linux/core.nix ];
+}

home/hosts/linux/k3s-test-1-master-1.nix

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+{
+  imports = [ ../../linux/core.nix ];
+}