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/en/features.json

@@ -37,5 +37,9 @@
   "htmlToMarkdown": {
     "title": "HTML to Markdown",
     "description": "Real-time HTML conversion and Markdown preview"
+  },
+  "rightClickRestorer": {
+    "title": "Right Click Restorer",
+    "description": "Detect and restore disabled browser right-click menus"
   }
 }

i18n/locales/en/rightClickRestorer.json

@@ -0,0 +1,11 @@
+{
+  "title": "Right Click Restorer",
+  "description": "Detect and restore disabled browser right-click menus",
+  "loading": "Loading...",
+  "currentDomain": "Current Domain",
+  "statusLocked": "Locked",
+  "statusUnlocked": "Unlocked",
+  "unlockDesc": "Click the button below to temporarily unlock the right-click menu for the current website. You will need to unlock again after refreshing the page.",
+  "unlockBtn": "Unlock Right Click",
+  "alreadyUnlocked": "Right Click Unlocked"
+}