refactor(storageCleaner): simplify architecture and improve type semantics

- Remove RELOAD_TAB message chain, use chrome.tabs.reload() directly
- Rename IndexedDB label to '站点存储' for accuracy
- Introduce StorageSizeInfo type to distinguish bytes vs count
- Rename totalSize to totalBytes for clarity
- Merge runCleanScript into runScript to reduce duplication
- Rename CleaningResult.success to overallSuccess to avoid confusion
- Remove unused domain state and setDomain call

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/_locales/zh/messages.json

@@ -697,7 +697,7 @@
     "description": "Translation key: storageCleaner_options_sessionStorage"
   },
   "storageCleaner_options_indexedDB": {
-    "message": "IndexedDB",
+    "message": "站点存储",
     "description": "Translation key: storageCleaner_options_indexedDB"
   },
   "storageCleaner_options_cookies": {