feat(v1.1.0): add send mail support via Graph API and SMTP

app/services/smtp.py

@@ -0,0 +1,22 @@
+import smtplib
+from email.message import EmailMessage
+
+def send_mail_smtp(host: str, port: int, username: str, password: str, to_email: str, subject: str, body_text: str, use_tls: bool = True, use_ssl: bool = False) -> bool:
+    """使用 SMTP 协议发送邮件"""
+    msg = EmailMessage()
+    msg["Subject"] = subject
+    msg["From"] = username
+    msg["To"] = to_email
+    msg.set_content(body_text)
+
+    if use_ssl:
+        with smtplib.SMTP_SSL(host, port, timeout=20) as server:
+            server.login(username, password)
+            server.send_message(msg)
+    else:
+        with smtplib.SMTP(host, port, timeout=20) as server:
+            if use_tls:
+                server.starttls()
+            server.login(username, password)
+            server.send_message(msg)
+    return True