feat: add reporting workflow and optimize dashboard loading

backend/config.example.yaml

@@ -35,6 +35,15 @@ monitoring:
     - 5
   turnover_warning_threshold: 0.30
 
+mail:
+  sender_email: "your_email@example.com"
+  smtp_username: "your_email@example.com"
+  smtp_password: "your_smtp_password"
+  smtp_host: "smtp.example.com"
+  smtp_port: 465
+  recipients:
+    - "recipient@example.com"
+
 traders:
   - name: "章盟主"
     alias: "章建平"