refactor(log): refactor the whole project

format: {time:YYYY-MM-DD HH:mm:ss} [{level}] | {name} | {message}
{name} is:
- Uvicorn: log from uvicorn server (#228B22)
- Service: log from class of `app.service` (blue)
- Fetcher: log from fetchers (magenta)
- Task: log from `app.tasks` (#FFD700)
- System: log from `system_logger` (red)
- Normal: log from `log(name)` (#FFC1C1)
- Default: the module name of caller

if you are writing services or tasks, you can just call `logger.`, we will pack it with name `Service` or `Task`
if you want to print fetcher logs, system-related logs, or normal logs, use `logger = (fetcher_logger / system_logger / log)(name)`

app/service/email_queue.py

@@ -221,11 +221,6 @@ class EmailQueue:
             是否发送成功
         """
         try:
-            # 如果邮件发送功能被禁用，则只记录日志
-            if not getattr(settings, "enable_email_sending", True):
-                logger.info(f"[Mock Email] Would send to {email_data.get('to_email')}: {email_data.get('subject')}")
-                return True
-
             # 创建邮件
             msg = MIMEMultipart("alternative")
             msg["From"] = f"{self.from_name} <{self.from_email}>"