feat(email_service): Support dynamic email configuration reloading

- Import EMAIL_API_AUTH and EMAIL_ROLE from config module on each function call
- Update create_email_user() to use dynamically loaded current_auth and current_role
- Update get_verification_code() to use dynamically loaded current_auth
- Update fetch_email_content() to use dynamically loaded current_auth
- Enable runtime configuration switching without service restart

email_service.py

@@ -442,14 +442,17 @@ def create_email_user(email: str, password: str = None, role_name: str = None) -
     Returns:
         tuple: (success, message)
     """
+    # 每次调用时重新获取配置，支持动态切换
+    from config import EMAIL_API_AUTH as current_auth, EMAIL_ROLE as current_role
+    
     if password is None:
         password = DEFAULT_PASSWORD
     if role_name is None:
-        role_name = EMAIL_ROLE
+        role_name = current_role
 
     url = f"{get_cloudmail_api_base()}/addUser"
     headers = {
-        "Authorization": EMAIL_API_AUTH,
+        "Authorization": current_auth,
         "Content-Type": "application/json"
     }
     payload = {
@@ -485,9 +488,12 @@ def get_verification_code(email: str, max_retries: int = None, interval: int = N
     Returns:
         tuple: (code, error, email_time) - 验证码、错误信息、邮件时间
     """
+    # 每次调用时重新获取配置，支持动态切换
+    from config import EMAIL_API_AUTH as current_auth
+    
     url = f"{get_cloudmail_api_base()}/emailList"
     headers = {
-        "Authorization": EMAIL_API_AUTH,
+        "Authorization": current_auth,
         "Content-Type": "application/json"
     }
     payload = {"toEmail": email}
@@ -566,9 +572,12 @@ def fetch_email_content(email: str) -> list:
     Returns:
         list: 邮件列表
     """
+    # 每次调用时重新获取配置，支持动态切换
+    from config import EMAIL_API_AUTH as current_auth
+    
     url = f"{get_cloudmail_api_base()}/emailList"
     headers = {
-        "Authorization": EMAIL_API_AUTH,
+        "Authorization": current_auth,
         "Content-Type": "application/json"
     }
     payload = {"toEmail": email}