fix: 修复域能相关数据表缺失及首次查询报错

- AutoMigrate 添加 EnergyLog、PostEnergizeLog、DailyExpSummary 三张表
- GetDailyEnergizeExp 无记录时返回 nil, nil 而非 gorm.ErrRecordNotFound
- 调用方增加 summary nil 检查，防止空指针

cmd/server/main.go

@@ -27,7 +27,7 @@ func main() {
 	if err != nil {
 		log.Fatalf("连接数据库失败: %v", err)
 	}
-	if err := db.AutoMigrate(&model.User{}, &model.AuditSubmission{}, &model.SiteSetting{}, &model.Notification{}, &model.Post{}, &model.UserCheckIn{}, &model.UserTask{}); err != nil {
+	if err := db.AutoMigrate(&model.User{}, &model.AuditSubmission{}, &model.SiteSetting{}, &model.Notification{}, &model.Post{}, &model.UserCheckIn{}, &model.UserTask{}, &model.EnergyLog{}, &model.PostEnergizeLog{}, &model.DailyExpSummary{}); err != nil {
 		log.Fatalf("数据库迁移失败: %v", err)
 	}
 

internal/repository/energy_repo.go

@@ -1,6 +1,7 @@
 package repository
 
 import (
+	"errors"
 	"time"
 
 	"metazone.cc/metalab/internal/model"
@@ -80,9 +81,13 @@ func (r *EnergyRepo) CreateEnergizeLog(log *model.PostEnergizeLog) error {
 }
 
 // GetDailyEnergizeExp 获取用户当日通过赋能获得的经验值
+// 无记录时返回 nil, nil（调用方当作 exp=0 处理）
 func (r *EnergyRepo) GetDailyEnergizeExp(userID uint, date time.Time) (*model.DailyExpSummary, error) {
 	var s model.DailyExpSummary
 	err := r.db.Where("user_id = ? AND date = ?", userID, date).First(&s).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, nil
+	}
 	if err != nil {
 		return nil, err
 	}

internal/service/energy_service.go

@@ -160,7 +160,7 @@ func (s *EnergyService) Energize(energizerID uint, postID uint, amount int) (int
 
 		summary, err := txRepo.GetDailyEnergizeExp(energizerID, today)
 		currentDaily := 0
-		if err == nil {
+		if err == nil && summary != nil {
 			currentDaily = summary.ExpEarned
 		}
 
@@ -305,7 +305,7 @@ func (s *EnergyService) GetEnergyInfo(userID uint) (*EnergyInfo, error) {
 
 	dailyExp := 0
 	summary, err := s.repo.GetDailyEnergizeExp(userID, today)
-	if err == nil {
+	if err == nil && summary != nil {
 		dailyExp = summary.ExpEarned
 	}