v1.8.0: warehouse module (16 commits), docházka mzda model, leave_type=holiday removal, api.ts race fix

Highlights:
- Warehouse module: receipts, issues, reservations, inventory, reports, dashboard,
  master data (categories, suppliers, locations), FIFO service, integration tests
- Docházka: mzda PDF counting model (Odpracováno / Vč. svátků / Přesčas / Svátek /
  So/Ne / Noc) with Czech weekday names and decimal hours
- AttendanceAdmin/AttendanceHistory KPI cards unified to mzda formula with
  fund bar colored by delta, badges for Práce/Dov/Nem/Sv/Nep
- Remove leave_type=holiday entirely (auto-computed from Czech public holidays)
- Allow multiple work shifts per day (overlap detection only)
- Pre-flight refresh in api.ts eliminates spurious 401s on fresh page loads
- Prisma: company_settings gets 6 nullable columns for warehouse numbering
  (PRI/VYD/INV prefixes, default patterns); migration seeds defaults

src/services/orders.service.ts

@@ -518,6 +518,46 @@ export async function deleteOrder(id: number) {
     select: { id: true, created_at: true },
   });
 
+  // Guard: projects may have non-cascaded warehouse refs (sklad_issues,
+  // sklad_reservations, attendance_project_logs all use project_id as a
+  // non-nullable FK with no onDelete). Surface as 409 (resource conflict)
+  // rather than letting Prisma throw P2003 -> 500.
+  //
+  // Only ACTIVE records count: a CANCELLED issue/restored batch or
+  // CANCELLED reservation is audit-trail-only (cancelIssue() has already
+  // restored the batch qty; cancelReservation() zeroes remaining_qty).
+  // Attendance project logs are time-records — they always block, since
+  // deleting the project would orphan the time record. The user must
+  // re-assign the attendance log to a different project first.
+  if (linkedProjects.length > 0) {
+    const projectIds = linkedProjects.map((p) => p.id);
+    const [activeIssuesCount, activeReservationsCount, attendanceLogCount] =
+      await Promise.all([
+        prisma.sklad_issues.count({
+          where: {
+            project_id: { in: projectIds },
+            status: { not: "CANCELLED" },
+          },
+        }),
+        prisma.sklad_reservations.count({
+          where: {
+            project_id: { in: projectIds },
+            status: { not: "CANCELLED" },
+          },
+        }),
+        prisma.attendance_project_logs.count({
+          where: { project_id: { in: projectIds } },
+        }),
+      ]);
+    if (activeIssuesCount + activeReservationsCount + attendanceLogCount > 0) {
+      return {
+        error:
+          "Nelze smazat objednávku, protože navázaný projekt má aktivní skladové výdeje, rezervace nebo docházkové záznamy. Zrušte je nebo přeřaďte docházku na jiný projekt.",
+        status: 409,
+      } as const;
+    }
+  }
+
   await prisma.$transaction(async (tx) => {
     // Clear quotation back-reference (matching PHP)
     await tx.quotations.updateMany({