Renders a vertical stack of titled sub-report sections, each in a Bootstrap box-body panel.
VReports — set as ReportType in def_report.
def Render(self, Param1="", Param2="", Param3="", Orientation="") -> str:
Param2 / Param3 — passed through to each embedded sub-report.
Returns a series of Bootstrap box-header/box-body div pairs, one per data row. The query must return at least two columns per row: section title (column 1) and report code (column 2); an optional third column provides the sub-report's Param1 (falls back to the outer Param1 if empty).