refactor: 迁移 i18n 系统从 react-i18next 到 chrome.i18n

- 移除 react-i18next、i18next 及相关依赖
- 删除旧的 i18n/ 目录和 useLazyTranslation 工具
- 新增 utils/chromeI18n.ts 类型安全 wrapper（useI18n Hook + getMessage）
- 生成 public/_locales/{zh,en}/messages.json（298 个翻译 key）
- 批量更新 39+ 组件文件的导入和翻译调用
- 转换翻译键格式：namespace:key → namespace_key
- 修复 ErrorBoundary/PageErrorBoundary 从 withTranslation HOC 改为直接调用 getMessage
- 更新 vitest.setup.ts mock 加载实际翻译文本
- 修复 11 个测试文件的断言以匹配中文翻译
- TypeScript、ESLint、547 项测试全部通过

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

config/features.tsx

@@ -46,7 +46,7 @@ export interface FeatureConfig {
 export const FEATURES: FeatureConfig[] = [
   {
     key: 'dashboard',
-    labelKey: 'features:dashboard.title',
+    labelKey: 'dashboard_title',
     descriptionKey: '',
     defaultVisible: true,
     components: {
@@ -57,8 +57,8 @@ export const FEATURES: FeatureConfig[] = [
   },
   {
     key: 'timestamp',
-    labelKey: 'features:timestamp.title',
-    descriptionKey: 'features:timestamp.description',
+    labelKey: 'timestamp_title',
+    descriptionKey: 'timestamp_description',
     themeColorKey: 'primary',
     icon: Clock,
     defaultVisible: true,
@@ -70,8 +70,8 @@ export const FEATURES: FeatureConfig[] = [
   },
   {
     key: 'storageCleaner',
-    labelKey: 'features:storageCleaner.title',
-    descriptionKey: 'features:storageCleaner.description',
+    labelKey: 'storageCleaner_title',
+    descriptionKey: 'storageCleaner_description',
     themeColorKey: 'warning',
     icon: Database,
     defaultVisible: true,
@@ -83,8 +83,8 @@ export const FEATURES: FeatureConfig[] = [
   },
   {
     key: 'qrCode',
-    labelKey: 'features:qrCode.title',
-    descriptionKey: 'features:qrCode.description',
+    labelKey: 'qrCode_title',
+    descriptionKey: 'qrCode_description',
     themeColorKey: 'success',
     icon: QrCode,
     defaultVisible: true,
@@ -96,8 +96,8 @@ export const FEATURES: FeatureConfig[] = [
   },
   {
     key: 'textStatistics',
-    labelKey: 'features:textStatistics.title',
-    descriptionKey: 'features:textStatistics.description',
+    labelKey: 'textStatistics_title',
+    descriptionKey: 'textStatistics_description',
     themeColorKey: 'secondary',
     icon: FileText,
     defaultVisible: true,
@@ -109,8 +109,8 @@ export const FEATURES: FeatureConfig[] = [
   },
   {
     key: 'jwt',
-    labelKey: 'features:jwt.title',
-    descriptionKey: 'features:jwt.description',
+    labelKey: 'jwt_title',
+    descriptionKey: 'jwt_description',
     themeColorKey: 'info',
     icon: Key,
     defaultVisible: true,
@@ -122,8 +122,8 @@ export const FEATURES: FeatureConfig[] = [
   },
   {
     key: 'jsonDiff',
-    labelKey: 'features:jsonDiff.title',
-    descriptionKey: 'features:jsonDiff.description',
+    labelKey: 'jsonDiff_title',
+    descriptionKey: 'jsonDiff_description',
     themeColorKey: 'primary',
     icon: GitCompareArrows,
     defaultVisible: true,
@@ -135,8 +135,8 @@ export const FEATURES: FeatureConfig[] = [
   },
   {
     key: 'base64Converter',
-    labelKey: 'features:base64Converter.title',
-    descriptionKey: 'features:base64Converter.description',
+    labelKey: 'base64Converter_title',
+    descriptionKey: 'base64Converter_description',
     themeColorKey: 'info',
     icon: ArrowLeftRight,
     defaultVisible: true,
@@ -148,8 +148,8 @@ export const FEATURES: FeatureConfig[] = [
   },
   {
     key: 'markdownToHtml',
-    labelKey: 'features:markdownToHtml.title',
-    descriptionKey: 'features:markdownToHtml.description',
+    labelKey: 'markdownToHtml_title',
+    descriptionKey: 'markdownToHtml_description',
     themeColorKey: 'secondary',
     icon: Code,
     defaultVisible: true,
@@ -161,8 +161,8 @@ export const FEATURES: FeatureConfig[] = [
   },
   {
     key: 'htmlToMarkdown',
-    labelKey: 'features:htmlToMarkdown.title',
-    descriptionKey: 'features:htmlToMarkdown.description',
+    labelKey: 'htmlToMarkdown_title',
+    descriptionKey: 'htmlToMarkdown_description',
     themeColorKey: 'secondary',
     icon: File,
     defaultVisible: true,
@@ -174,8 +174,8 @@ export const FEATURES: FeatureConfig[] = [
   },
   {
     key: 'rightClickRestorer',
-    labelKey: 'features:rightClickRestorer.title',
-    descriptionKey: 'features:rightClickRestorer.description',
+    labelKey: 'rightClickRestorer_title',
+    descriptionKey: 'rightClickRestorer_description',
     themeColorKey: 'success',
     icon: MousePointerClick,
     defaultVisible: true,