fix(telegram_bot): Correct GPTMail API endpoint and authentication method

- Change API endpoint from `/api/mail/list` to `/api/generate-email`
- Update HTTP method from POST to GET request
- Replace `Authorization` header with `X-API-Key` for proper authentication
- Remove unnecessary payload parameter from API request
- Enhance response handling to extract and display generated test email
- Add error message parsing from API response for better debugging
- Improve test connection feedback to show actual generated email address

telegram_bot.py

@@ -4572,17 +4572,22 @@ class ProvisionerBot:
                     return False, "没有配置 GPTMail API Key"
                 
                 api_key = keys[0]
-                url = f"{GPTMAIL_API_BASE}/api/mail/list"
+                # 使用正确的 API 接口: /api/generate-email (GET 请求)
+                url = f"{GPTMAIL_API_BASE}/api/generate-email"
                 headers = {
-                    "Authorization": f"Bearer {api_key}",
+                    "X-API-Key": api_key,  # 正确的请求头
                     "Content-Type": "application/json"
                 }
-                payload = {"email": "test@test.com", "limit": 1}
                 
-                response = requests.post(url, headers=headers, json=payload, timeout=10)
+                response = requests.get(url, headers=headers, timeout=10)
                 
                 if response.status_code == 200:
-                    return True, "API 连接正常"
+                    data = response.json()
+                    if data.get("success"):
+                        email = data.get("data", {}).get("email", "")
+                        return True, f"生成测试邮箱: {email}"
+                    else:
+                        return False, data.get("error", "Unknown error")
                 else:
                     return False, f"HTTP {response.status_code}"