feat(ECR-011): 昵称、首页贴士与档案 Self 唯一/合盘交叉校验

每账号仅一条 self（migration 40902）；合盘只选 TA；账号昵称可改；首页穿衣/颜色/养生贴士。

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

apps/api/internal/service/report/service.go

@@ -163,6 +163,9 @@ func (s *Service) CreateStar(ctx context.Context, userID, profileID uuid.UUID) (
 // CreateSynastry builds a multi-chart synastry report for two profiles.
 // asOf is the secondary-progression date (defaults to today CST when nil/zero).
 func (s *Service) CreateSynastry(ctx context.Context, userID, profileAID, profileBID uuid.UUID, asOf *time.Time) (*model.GrowthReport, error) {
+	if profileAID == profileBID {
+		return nil, errors.New("合盘需要两个不同档案")
+	}
 	pa, err := s.Profiles.GetForUser(ctx, userID, profileAID)
 	if err != nil {
 		return nil, errors.New("profile a not found")
@@ -174,6 +177,8 @@ func (s *Service) CreateSynastry(ctx context.Context, userID, profileAID, profil
 		if err != nil || !pb.GeoVisible || pb.Relation != "self" || pb.UserID == userID {
 			return nil, errors.New("profile b not found")
 		}
+	} else if pb.Relation != "other" {
+		return nil, errors.New("合盘对象须为 TA 档案或附近的人")
 	}
 	ca, err := star.NatalChart(pa.BirthDate, pa.BirthTime, pa.BirthPlace)
 	if err != nil {