feat: add right-click restorer for current site

- Add RightClickRestorer page with active unlock trigger
- Content script with dual-world strategy (isolated + main world)
- Monkey patch preventDefault/stopPropagation via background executeScript
- Overlay penetration for pointer-events blocking layers
- Delegated main-world injection to avoid CSP restrictions
- Async message handling for reliable state updates
- i18n translations (zh/en) and unit tests

i18n/locales/zh/features.json

@@ -37,5 +37,9 @@
   "htmlToMarkdown": {
     "title": "HTML 转 Markdown",
     "description": "实时 HTML 转换与 Markdown 预览"
+  },
+  "rightClickRestorer": {
+    "title": "右键恢复",
+    "description": "检测并恢复被网站禁用的浏览器右键菜单"
   }
 }

i18n/locales/zh/rightClickRestorer.json

@@ -0,0 +1,11 @@
+{
+  "title": "右键恢复",
+  "description": "检测并恢复被网站禁用的浏览器右键菜单",
+  "loading": "正在加载...",
+  "currentDomain": "当前域名",
+  "statusLocked": "未解锁",
+  "statusUnlocked": "已解锁",
+  "unlockDesc": "点击下方按钮，为当前网站临时解锁右键菜单。刷新页面后需要重新解锁。",
+  "unlockBtn": "解锁当前网站右键",
+  "alreadyUnlocked": "右键已解锁"
+}