feat: 跨实例同步移植第9轮（游戏设置编辑器）

搬入 game-settings-modal（游戏选项精细编辑，10 文件）：设置行编辑器、按键绑定、语言选择与文案表。新增 app-settings-modal provider 与 instance-settings-context 转发，并把 instance-settings 的 closeModal 改为支持关闭回调。SyncSettings 恢复游戏设置入口。补齐 game-options 相关 en-US / zh-CN 文案。

apps/app-frontend/src/providers/app-settings-modal.ts

@@ -0,0 +1,18 @@
+import type { InjectionKey } from 'vue'
+
+export type UnsavedChangesController = {
+	hasChanges: () => boolean
+	getOriginal: () => Record<string, unknown>
+	getModified: () => Record<string, unknown>
+	isSaving: () => boolean
+	reset: () => void
+	save: () => void | Promise<void>
+}
+
+export type AppSettingsModalContext = {
+	close: () => boolean
+	registerUnsavedChangesController: (controller: UnsavedChangesController | null) => void
+}
+
+export const appSettingsModalContextKey: InjectionKey<AppSettingsModalContext> =
+	Symbol('appSettingsModalContext')

apps/app-frontend/src/providers/instance-settings.ts

@@ -8,7 +8,7 @@ export interface InstanceSettingsContext {
 	offline?: boolean
 	isMinecraftServer: Ref<boolean>
 	onUnlinked: () => void
-	closeModal?: () => void
+	closeModal?: (onAfterClose?: () => void) => void
 }
 
 export const [injectInstanceSettings, provideInstanceSettings] =