新增TempMailPlus配置，支持临时邮箱验证功能。更新CursorRegistration类以集成TempMailPlus，并添加相应的国际化支持。新增EmailTabInterface和TempMailPlusTab类以实现邮箱验证逻辑。

email_tabs/email_tab_interface.py

@@ -0,0 +1,27 @@
+from abc import ABC, abstractmethod
+
+class EmailTabInterface(ABC):
+    """Email tab interface for handling email verification"""
+    
+    @abstractmethod
+    def refresh_inbox(self) -> None:
+        """Refresh the email inbox"""
+        pass
+    
+    @abstractmethod
+    def check_for_cursor_email(self) -> bool:
+        """Check if there is a verification email from Cursor
+        
+        Returns:
+            bool: True if verification email exists, False otherwise
+        """
+        pass
+    
+    @abstractmethod
+    def get_verification_code(self) -> str:
+        """Get the verification code from the email
+        
+        Returns:
+            str: The verification code if found, empty string otherwise
+        """
+        pass