chore: drop makima/Typora/xournalpp; gate fcitx5/voxtype/opencode behind options

Tier A removals — small, half-wired modules nobody had asked for:

- makima (Copilot-key remapper): drop core/system/makima.nix, the
  features/apps/makima/ keyboard.toml, the nomarchy-restart-makima script,
  the `nomarchy.system.features.makima` option, the state-file binding,
  the import in core/system/default.nix, and the "Key Remapping" entry
  in nomarchy-menu. ~50 LoC + a service nobody asked for.
- Typora theme dir (core/home/config/Typora/) — Typora is a paid tool
  Nomarchy doesn't even ship; the SUPER+SHIFT+W keybinding pointed at a
  binary that wasn't on PATH.
- xournalpp settings (core/home/config/xournalpp/) — referenced
  /usr/share paths that don't exist on NixOS.
- core/home/config/environment.d/fcitx.conf — manual env vars are
  redundant once fcitx5 routes through NixOS's i18n.inputMethod.

Optionalization — three half-wired features now sit behind explicit
toggles, all default off (except keyring which keeps its existing
default-on):

- nomarchy.system.inputMethod.enable: new core/system/input-method.nix
  uses NixOS's i18n.inputMethod with fcitx5 + mozc/chinese/table addons.
  Drops the Hyprland exec-once line — i18n.inputMethod handles autostart.
- nomarchy.system.voxtype.enable: marker option for users who install
  voxtype out-of-band (it's not in nixpkgs). Today it just documents
  intent; the existing keybinding + waybar widget no-op gracefully.
- nomarchy.apps.opencode.enable: gates the existing
  features/apps/opencode/default.nix xdg.configFile so the opencode
  config only deploys when the user opts in.

Installer:
- system.nix and home.nix templates now surface the new toggles in their
  "Optional Nomarchy modules" comment blocks.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

core/system/options.nix

@@ -40,11 +40,6 @@
         default = false;
         description = "Whether to enable hybrid GPU support (supergfxd).";
       };
-      makima = lib.mkOption {
-        type = lib.types.bool;
-        default = false;
-        description = "Whether to enable makima key remapper.";
-      };
     };
     theme = lib.mkOption {
       type = lib.types.str;
@@ -102,5 +97,22 @@
         '';
       };
     };
+
+    inputMethod = {
+      enable = lib.mkEnableOption ''
+        fcitx5 input method (CJK / IME). Wires NixOS's i18n.inputMethod and
+        autostarts fcitx5-daemon. Adds a small footprint when enabled, so
+        most users want this off.
+      '';
+    };
+
+    voxtype = {
+      enable = lib.mkEnableOption ''
+        voxtype voice-typing integration. NOTE: voxtype is not packaged in
+        nixpkgs — when enabled, install voxtype yourself (e.g. via
+        `home.packages = [ (pkgs.callPackage … {}) ]`). With this off the
+        SUPER+CTRL+X keybinding and waybar widget are no-ops.
+      '';
+    };
   };
 }