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/crawlers/base.py

@@ -95,9 +95,11 @@ class BaseCrawler(ABC):
 
     def _send_notifications(self, items: List[Dict]) -> None:
         sent = False
+        # Build subject/body via hook for consistency across crawlers
+        subject, body = self._build_email(items)
         if self.config.email:
             try:
-                notif.send_email(items, self.config.email)
+                notif.send_custom_email(subject, body, self.config.email)
                 sent = True
             except Exception as e:
                 self.logger.error(f"電子郵件通知失敗: {e}")
@@ -116,6 +118,23 @@ class BaseCrawler(ABC):
         if sent:
             self.stats['last_notification'] = datetime.now().isoformat()
 
+    def _build_email(self, items: List[Dict]):
+        """Construct a generic email subject and body.
+
+        Subclasses can override to customize content/format.
+        """
+        subject = f"{self.name} ({len(items)}條)"
+        lines = []
+        for pick in items:
+            line = f"📊 {pick.get('title','').strip()}\n"
+            if pick.get('link'):
+                line += f"🔗 {pick['link']}\n"
+            line += f"🕒 {pick.get('scraped_at', datetime.now().isoformat())}\n"
+            line += "-" * 60 + "\n"
+            lines.append(line)
+        body = f"發現 {len(items)} 條新內容：\n\n" + "".join(lines)
+        return subject, body
+
     # --- Run loop ---
     def _signal_handler(self, signum, frame):
         self.logger.info("收到停止信號，正在關閉...")