释义搜索改回 Google，搜索词用释义加"是什么意思"

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

LearnEnglish/LearnEnglish/Views/WordDetailViewController.swift

@@ -188,8 +188,9 @@ final class WordDetailViewController: UIViewController {
 
     private func searchMeaning() {
         Haptics.selection()
-        guard let encoded = word.meaning.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed),
+        let text = "\(word.meaning) 是什么意思"
-              let url = URL(string: "https://baike.baidu.com/item/\(encoded)") else { return }
+        guard let query = text.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed),
+              let url = URL(string: "https://www.google.com/search?q=\(query)") else { return }
         present(SFSafariViewController(url: url), animated: true)
     }