feat(config,email_service): Add Cloud Mail API path auto-completion utility

- Add get_cloudmail_api_base() helper function to automatically append /api/public path to EMAIL_API_BASE
- Update create_email_user() to use get_cloudmail_api_base() for consistent API endpoint construction
- Update get_verification_code() to use get_cloudmail_api_base() for email list retrieval
- Update fetch_email_content() to use get_cloudmail_api_base() for email list retrieval
- Refactor telegram_bot.py to use centralized path completion logic instead of inline implementation
- Improve API endpoint consistency across email service operations and reduce code duplication

email_service.py

@@ -27,6 +27,7 @@ from config import (
     get_random_gptmail_domain,
     get_next_gptmail_key,
     get_gptmail_keys,
+    get_cloudmail_api_base,
 )
 from logger import log
 
@@ -446,7 +447,7 @@ def create_email_user(email: str, password: str = None, role_name: str = None) -
     if role_name is None:
         role_name = EMAIL_ROLE
 
-    url = f"{EMAIL_API_BASE}/addUser"
+    url = f"{get_cloudmail_api_base()}/addUser"
     headers = {
         "Authorization": EMAIL_API_AUTH,
         "Content-Type": "application/json"
@@ -484,7 +485,7 @@ 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
     """
-    url = f"{EMAIL_API_BASE}/emailList"
+    url = f"{get_cloudmail_api_base()}/emailList"
     headers = {
         "Authorization": EMAIL_API_AUTH,
         "Content-Type": "application/json"
@@ -565,7 +566,7 @@ def fetch_email_content(email: str) -> list:
     Returns:
         list: 邮件列表
     """
-    url = f"{EMAIL_API_BASE}/emailList"
+    url = f"{get_cloudmail_api_base()}/emailList"
     headers = {
         "Authorization": EMAIL_API_AUTH,
         "Content-Type": "application/json"