refactor(notifications): unify email sending via _send_email; standardize crawler notifications\n\n- Extract _send_email and have send_email/send_custom_email share it\n- BaseCrawler: centralize _send_notifications and add _build_email hook\n- BarronsCrawler: override _build_email to keep original subject/body\n- OpenInsiderCrawler: remove custom _send_notifications, add _build_email\n- /notify_test: use crawler _build_email + send_custom_email for emails

app/services/notifications.py

@@ -21,28 +21,7 @@ def format_email_body(new_picks: List[Dict]) -> str:
     return body
 
 
-def send_email(new_picks: List[Dict], cfg: EmailConfig) -> None:
-    msg = MIMEMultipart()
-    msg['From'] = cfg.from_email
-    msg['To'] = cfg.to_email
-    msg['Subject'] = f"📈 Barron's 新股票推薦 ({len(new_picks)}條)"
-    msg.attach(MIMEText(format_email_body(new_picks), 'plain', 'utf-8'))
-
-    if cfg.smtp_security == 'ssl':
-        server = smtplib.SMTP_SSL(cfg.smtp_server, cfg.smtp_port)
-    else:
-        server = smtplib.SMTP(cfg.smtp_server, cfg.smtp_port)
-        server.ehlo()
-        if cfg.smtp_security == 'starttls':
-            server.starttls()
-            server.ehlo()
-
-    server.login(cfg.username, cfg.password)
-    server.send_message(msg)
-    server.quit()
-
-
-def send_custom_email(subject: str, body: str, cfg: EmailConfig) -> None:
+def _send_email(subject: str, body: str, cfg: EmailConfig) -> None:
     msg = MIMEMultipart()
     msg['From'] = cfg.from_email
     msg['To'] = cfg.to_email
@@ -63,6 +42,16 @@ def send_custom_email(subject: str, body: str, cfg: EmailConfig) -> None:
     server.quit()
 
 
+def send_email(new_picks: List[Dict], cfg: EmailConfig) -> None:
+    subject = f"📈 Barron's 新股票推薦 ({len(new_picks)}條)"
+    body = format_email_body(new_picks)
+    _send_email(subject, body, cfg)
+
+
+def send_custom_email(subject: str, body: str, cfg: EmailConfig) -> None:
+    _send_email(subject, body, cfg)
+
+
 def send_webhook(new_picks: List[Dict], url: str) -> None:
     message = f"🚨 發現 {len(new_picks)} 條新的 Barron's 股票推薦！\n\n"
     for pick in new_picks[:5]: