chore(pos): fully remove the classic POS

POS v2 has been the default at /pos for a while; this deletes the old classic
POS entirely:
- removed the /pos-classic route and all classic-only components
  (pos-screen, pos-pay-panel, pos-table-board, pos-queue-bar, pos-receipt-modal,
  pos-slip-modal, pos-receipt-print.css)
- relocated the two modules POS v2 still shared into the pos2 tree
  (lib/pos/submit-order → lib/pos2, components/pos/pos-customer-picker → pos2),
  so the components/pos and lib/pos folders are gone
- dropped the now-dead "نسخه کلاسیک" (classic version) button + RotateCcw import
  from the POS v2 header, and updated stale comments

POS v2 (/pos) is unchanged and fully self-contained. Typecheck clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/dashboard/src/components/pos2/pos2-screen.tsx

@@ -12,7 +12,7 @@ import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
 import {
   Search, Plus, Minus, Trash2, Send, CreditCard, SplitSquareHorizontal,
   X, WifiOff, ShoppingCart, Users, Coffee, ArrowRight, LayoutGrid, Armchair,
-  Banknote, Check, Delete, ReceiptText, ShoppingBag, Loader2, RotateCcw,
+  Banknote, Check, Delete, ReceiptText, ShoppingBag, Loader2,
   BadgePercent, Sparkles, Home, StickyNote,
 } from "lucide-react";
 import { cn } from "@/lib/utils";
@@ -22,10 +22,10 @@ import { useAuthStore } from "@/lib/stores/auth.store";
 import { useBranchStore } from "@/lib/stores/branch.store";
 import { useCartStore } from "@/lib/stores/cart.store";
 import { apiGet, apiPost, ApiClientError } from "@/lib/api/client";
-import { submitOrderToApi, orderAmountDue, isLocalOrder } from "@/lib/pos/submit-order";
+import { submitOrderToApi, orderAmountDue, isLocalOrder } from "@/lib/pos2/submit-order";
 import { requestPosPayment, posDeviceErrorMessage } from "@/lib/api/pos-device";
 import { printReceipt } from "@/lib/api/print";
-import { PosCustomerPicker } from "@/components/pos/pos-customer-picker";
+import { PosCustomerPicker } from "@/components/pos2/pos-customer-picker";
 import { Can } from "@/components/auth/can";
 import type { Customer, MenuItem, Order, TableBoardItem } from "@/lib/api/types";
 import { usePos2Categories, usePos2Menu, usePos2Tables, useMenuById } from "@/lib/pos2/use-pos2";
@@ -387,13 +387,6 @@ export function Pos2Screen() {
           </span>
           <div className="flex-1" />
           {offlineBadge}
-          <button
-            type="button"
-            onClick={() => router.push("/pos-classic")}
-            className="hidden min-h-[40px] cursor-pointer items-center gap-1.5 rounded-xl px-3 text-sm font-medium text-muted-foreground transition-colors hover:bg-accent sm:flex"
-          >
-            <RotateCcw className="size-4" /> نسخه کلاسیک
-          </button>
           <button
             type="button"
             onClick={openTakeaway}