feat: 通用授权后台、离线证、Waffo 支付页与仪表盘加强

支持多产品计划展示、LICOFF 离线签发、支付独立配置与调试，以及分析看板；同步更新 README 与集成文档。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/internal/service/license/license_service.go

@@ -7,6 +7,7 @@ import (
 	"encoding/json"
 	"errors"
 	"strconv"
+	"strings"
 	"time"
 
 	"gorm.io/gorm"
@@ -28,6 +29,7 @@ type ListQuery struct {
 	Status     string
 	CustomerID uint
 	ProductID  uint
+	Channel    string // online | offline | ""(全部)
 }
 
 // List 分页查询 License // Logan.Li
@@ -35,7 +37,7 @@ func (s *LicenseService) List(page, pageSize int, q ListQuery) ([]dto.LicenseRes
 	var licenses []model.License
 	var total int64
 
-	query := s.db.Model(&model.License{}).Preload("Customer").Preload("Product")
+	query := s.db.Model(&model.License{}).Preload("Customer").Preload("Product").Preload("Activations")
 	if q.Keyword != "" {
 		query = query.Where("license_key LIKE ?", "%"+q.Keyword+"%")
 	}
@@ -48,6 +50,12 @@ func (s *LicenseService) List(page, pageSize int, q ListQuery) ([]dto.LicenseRes
 	if q.ProductID > 0 {
 		query = query.Where("product_id = ?", q.ProductID)
 	}
+	switch strings.TrimSpace(q.Channel) {
+	case "offline":
+		query = query.Where("license_key LIKE ?", "LICOFF-%")
+	case "online":
+		query = query.Where("license_key NOT LIKE ?", "LICOFF-%")
+	}
 
 	query.Count(&total)
 	if err := query.Order("created_at DESC").
@@ -165,12 +173,15 @@ func (s *LicenseService) Delete(id uint) (*model.License, error) {
 	return &lic, nil
 }
 
-// Renew 续期 // Logan.Li
+// Renew 续期（仅在线证；离线证签名自包含，到期后应重新签发） // Logan.Li
 func (s *LicenseService) Renew(id uint, duration int) (*dto.LicenseResponse, error) {
 	var lic model.License
 	if err := s.db.First(&lic, id).Error; err != nil {
 		return nil, errors.New("License 不存在")
 	}
+	if utils.IsOfflineLicenseKey(lic.LicenseKey) {
+		return nil, errors.New("离线许可证不可续期：到期后请重新签发新序列号（绑定同一设备 ID）")
+	}
 
 	var newEndDate time.Time
 	if duration == model.DurationForever {
@@ -300,9 +311,25 @@ func toLicenseResponse(l model.License) dto.LicenseResponse {
 	if l.Product.ID > 0 {
 		productName = l.Product.Name
 	}
+	offline := utils.IsOfflineLicenseKey(l.LicenseKey)
+	channel := "online"
+	if offline {
+		channel = "offline"
+	}
+	deviceID := ""
+	for _, a := range l.Activations {
+		if strings.TrimSpace(a.DeviceID) != "" {
+			deviceID = a.DeviceID
+			break
+		}
+	}
 	return dto.LicenseResponse{
 		ID:                 l.ID,
 		LicenseKey:         l.LicenseKey,
+		LicenseKeyShort:    shortLicenseKey(l.LicenseKey),
+		Channel:            channel,
+		IsOffline:          offline,
+		DeviceID:           deviceID,
 		CustomerID:         l.CustomerID,
 		CustomerName:       customerName,
 		ProductID:          l.ProductID,
@@ -320,6 +347,18 @@ func toLicenseResponse(l model.License) dto.LicenseResponse {
 	}
 }
 
+// shortLicenseKey 表格短展示：在线保留全文；离线保留前缀+尾部。 // Logan.Li
+func shortLicenseKey(key string) string {
+	key = strings.TrimSpace(key)
+	if !utils.IsOfflineLicenseKey(key) {
+		return key
+	}
+	if len(key) <= 28 {
+		return key
+	}
+	return key[:14] + "…" + key[len(key)-8:]
+}
+
 // toActivationResponse 模型转响应 DTO // Logan.Li
 func toActivationResponse(a model.Activation) dto.ActivationResponse {
 	return dto.ActivationResponse{