Flatten webhook payload for simpler template access

- Add uid, from, subject at top level of WebhookPayload
- Allows {{body.from}} instead of {{body.message.from}}
- Fixes empty fields in OpenClaw hook templates
- Full message object still available for detailed access

main.go

@@ -67,10 +67,16 @@ type Message struct {
 }
 
 // WebhookPayload for new mail events
+// Fields are flattened for simpler template access ({{body.from}} vs {{body.message.from}})
 type WebhookPayload struct {
 	Event   string   `json:"event"`
 	Account string   `json:"account"`
 	Folder  string   `json:"folder"`
+	// Flattened message fields for easier template access
+	UID     uint32 `json:"uid"`
+	From    string `json:"from"`
+	Subject string `json:"subject"`
+	// Full message object still available for detailed access
 	Message *Message `json:"message,omitempty"`
 }
 
@@ -266,11 +272,14 @@ func handleNewMail(accountName string, acc AccountConfig, folder string) {
 	msg := msgs[0]
 	log.Printf("[%s] Webhook: from=%q subject=%q", accountName, msg.From, msg.Subject)
 
-	// Send webhook
+	// Send webhook with flattened fields for easy template access
 	payload := WebhookPayload{
 		Event:   "new_mail",
 		Account: accountName,
 		Folder:  folder,
+		UID:     msg.UID,
+		From:    msg.From,
+		Subject: msg.Subject,
 		Message: msg,
 	}