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

prisma/schema.prisma

@@ -128,6 +128,12 @@ model company_settings {
   offer_number_pattern     String?   @db.VarChar(100)
   order_number_pattern     String?   @db.VarChar(100)
   invoice_number_pattern   String?   @db.VarChar(100)
+  warehouse_receipt_prefix          String?   @db.VarChar(20)
+  warehouse_receipt_number_pattern  String?   @db.VarChar(100)
+  warehouse_issue_prefix            String?   @db.VarChar(20)
+  warehouse_issue_number_pattern    String?   @db.VarChar(100)
+  warehouse_inventory_prefix        String?   @db.VarChar(20)
+  warehouse_inventory_number_pattern String?   @db.VarChar(100)
 }
 
 model customers {
@@ -785,7 +791,7 @@ model sklad_receipts {
 
   supplier               sklad_suppliers? @relation(fields: [supplier_id], references: [id])
   received_by_user       users? @relation("SkladReceivedBy", fields: [received_by], references: [id])
-  lines                  sklad_receipt_lines[]
+  items                  sklad_receipt_lines[]
   attachments            sklad_receipt_attachments[]
 
   @@map("sklad_receipts")
@@ -835,7 +841,7 @@ model sklad_issues {
 
   project       projects @relation(fields: [project_id], references: [id])
   issued_by_user users? @relation("SkladIssuedBy", fields: [issued_by], references: [id])
-  lines         sklad_issue_lines[]
+  items         sklad_issue_lines[]
 
   @@map("sklad_issues")
 }
@@ -889,7 +895,7 @@ model sklad_inventory_sessions {
   created_at      DateTime? @default(now()) @db.DateTime(0)
   modified_at     DateTime? @db.DateTime(0)
 
-  lines           sklad_inventory_lines[]
+  items           sklad_inventory_lines[]
 
   @@map("sklad_inventory_sessions")
 }