feat: 添加移动端下拉菜单和主题色设置

- 新增 MobileMenu 组件，小屏幕使用汉堡菜单替代多个按钮
- 重构 LanguageSettings 为统一下拉框样式
- 新增设置页面，支持主题色切换
- 翻译页添加源语言选择器
- 更新 8 种语言的 i18n 翻译

src/modules/translator/translator-action-dto.ts

@@ -14,6 +14,7 @@ const schemaActionInputTranslateText = z.object({
     forceRetranslate: z.boolean().optional().default(false),
     needIpa: z.boolean().optional().default(true),
     userId: z.string().optional(),
+    sourceLanguage: z.string().min(LENGTH_MIN_LANGUAGE).max(LENGTH_MAX_LANGUAGE).optional(),
 });
 
 export type ActionInputTranslateText = z.infer<typeof schemaActionInputTranslateText>;

src/modules/translator/translator-service-dto.ts

@@ -6,6 +6,7 @@ export type ServiceInputTranslateText = {
     forceRetranslate: boolean;
     needIpa: boolean;
     userId?: string;
+    sourceLanguage?: string;
 };
 
 export type ServiceOutputTranslateText = TSharedTranslationResult;

src/modules/translator/translator-service.ts

@@ -8,7 +8,7 @@ const log = createLogger("translator-service");
 export const serviceTranslateText = async (
     dto: ServiceInputTranslateText
 ): Promise<ServiceOutputTranslateText> => {
-    const { sourceText, targetLanguage, forceRetranslate, needIpa, userId } = dto;
+    const { sourceText, targetLanguage, forceRetranslate, needIpa, userId, sourceLanguage } = dto;
 
     // Check for existing translation
     const lastTranslation = await repoSelectLatestTranslation({
@@ -21,7 +21,8 @@ export const serviceTranslateText = async (
         const response = await executeTranslation(
             sourceText,
             targetLanguage,
-            needIpa
+            needIpa,
+            sourceLanguage
         );
 
         // Save translation history asynchronously (don't block response)