feat(dictionary): add Hachidori backend support

- Add backend selection, setup gating, Anki integration, and external host support
- Add launcher flags, documentation, packaging, and focused tests
- Open on-demand overlay modals on the first attempt

src/main/runtime/cli-command-context.ts

@@ -52,6 +52,7 @@ export type CliCommandContextFactoryDeps = {
   runYoutubePlaybackFlow: CliCommandRuntimeServiceContext['runYoutubePlaybackFlow'];
   ensureBackgroundStatsServer?: CliCommandRuntimeServiceContext['ensureBackgroundStatsServer'];
   openYomitanSettings: () => void;
+  openHachidoriSettings: () => void;
   openConfigSettingsWindow: () => void;
   openSyncUiWindow: () => void;
   cycleSecondarySubMode: () => void;
@@ -134,6 +135,7 @@ export function createCliCommandContext(
     runYoutubePlaybackFlow: deps.runYoutubePlaybackFlow,
     ensureBackgroundStatsServer: deps.ensureBackgroundStatsServer,
     openYomitanSettings: deps.openYomitanSettings,
+    openHachidoriSettings: deps.openHachidoriSettings,
     openConfigSettingsWindow: deps.openConfigSettingsWindow,
     openSyncUiWindow: deps.openSyncUiWindow,
     cycleSecondarySubMode: deps.cycleSecondarySubMode,