添加新功能，完善项目

internal/model/user.go

@@ -55,6 +55,9 @@ type User struct {
 	// expires. When set and in the past, the account is treated as expired
 	// (login blocked) until an admin or a redemption code renews it.
 	ExpiredAt *time.Time `json:"expired_at,omitempty"`
+	// TelegramChatID 是用户绑定的 Telegram 会话 ID，用于接收账号与设备通知。
+	// 为空表示未绑定；绑定走个人资料页生成的一次性码 + Bot /bind 命令。
+	TelegramChatID string `gorm:"size:64" json:"telegram_chat_id,omitempty"`
 	// ShareWarnings counts anti-account-sharing warnings, mainly device
 	// fingerprint mismatches. Once it exceeds the configured threshold a
 	// re-offence disables the account until an admin re-enables it.

internal/model/user_telegram_test.go

@@ -0,0 +1,24 @@
+package model
+
+import (
+	"sync"
+	"testing"
+
+	"gorm.io/gorm/schema"
+)
+
+// TelegramChatID 是 Telegram 通知的绑定目标：Size 必须容得下真实 chat id
+// （群/频道 id 为负数且位数更长），因此下限设为 64。
+func TestUserTelegramChatIDFieldSize(t *testing.T) {
+	parsed, err := schema.Parse(&User{}, &sync.Map{}, schema.NamingStrategy{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	field := parsed.LookUpField("TelegramChatID")
+	if field == nil {
+		t.Fatal("TelegramChatID field not found")
+	}
+	if field.Size < 64 {
+		t.Fatalf("TelegramChatID size = %d, want at least 64", field.Size)
+	}
+}