Add stored form views, SO line compute, invoice line demo data

- Stored form views for CRM lead, purchase order, HR employee, project
- SO line price_subtotal compute (qty * price * (1 - discount/100))
- Invoice lines seeded for demo invoices (product + tax + receivable)
- O2M lines now visible in form views (sale orders + invoices)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pkg/server/web_methods.go

@@ -442,12 +442,12 @@ func (s *Server) handleReadGroup(rs *orm.Recordset, params CallKWParams) (interf
 		// web_read_group: also get total group count (without limit/offset)
 		totalLen := len(results)
 		if opts.Limit > 0 || opts.Offset > 0 {
-			// Re-query without limit/offset to get total
 			allResults, err := rs.ReadGroup(domain, groupby, []string{"__count"})
 			if err == nil {
 				totalLen = len(allResults)
 			}
 		}
+
 		return map[string]interface{}{
 			"groups": groups,
 			"length": totalLen,