fix: validate explicit migrations and preserve large business ids

cmd/channel_portrait_http_test.go

@@ -180,7 +180,7 @@ func TestChannelPortraitHTTPTotalTiersAndScope(t *testing.T) {
 	}
 	data = call(7, "sourceDb=lx&promoteId=101&period=last7", 0)
 	basic = data["basic"].(map[string]any)
-	if basic["parentPromoteId"] != float64(100) || basic["parentPromoteName"] != "root-account" || basic["lastLoginTime"] != nil {
+	if basic["parentPromoteId"] != "100" || basic["parentPromoteName"] != "root-account" || basic["lastLoginTime"] != nil {
 		t.Fatal("上级应读同平台当前账号，不能沿用旧快照名")
 	}
 	call(99, "sourceDb=lx&promoteId=100", 7)
@@ -189,7 +189,7 @@ func TestChannelPortraitHTTPTotalTiersAndScope(t *testing.T) {
 		t.Fatal(err)
 	}
 	data = call(7, "sourceDb=lx&promoteId=100", 0)
-	if data["available"] != false || data["metrics"] != nil || data["basic"].(map[string]any)["promoteId"] != float64(100) {
+	if data["available"] != false || data["metrics"] != nil || data["basic"].(map[string]any)["promoteId"] != "100" {
 		t.Fatal("缺数据时应保留已授权基本资料并标明未知")
 	}
 }