feat: Add A6 PDF QR stickers with human-readable order info

Implement QrStickerService to generate both SVG (web) and PDF (print) stickers:

- Generate 32x32mm QR codes using SimpleSoftwareIO
- Create A6 (148mm  105mm) PDF stickers using DomPDF
- Include human-readable info: order number, customer, status, date, tracking
- Store order type (STOCK/CUSTOM) with visual badge
- Add generation timestamp to footer

Create stickers/qr-sticker.blade.php template:
- Two-column layout: info left, QR right
- Styled for A6 landscape printing
- Shows order number, customer, status, date, tracking info
- QR code positioned for easy scanning
- Print-optimized CSS

Update GenerateQrCodeOnOrderCreated listener:
- Now calls QrStickerService::generateSticker()
- Generates both SVG and PDF on OrderCreated event
- Logs paths to both formats

Add OpsController::downloadSticker() endpoint:
- GET /ops/orders/{id}/sticker/download
- Returns PDF with filename QR-{order_number}.pdf
- Requires ops access authorization
- Logs all downloads with user context

Update ops order-detail view:
- Add download button for A6 sticker PDF
- Position next to QR code display
- Link to new sticker download route

app/Http/Controllers/OpsController.php

@@ -200,4 +200,39 @@ class OpsController extends Controller
 
         return $actions;
     }
+
+    /**
+     * Download QR sticker PDF for printing
+     * 
+     * GET /ops/orders/{id}/sticker/download
+     */
+    public function downloadSticker(Order $order)
+    {
+        // Authorize
+        if (! auth()->user()->can('access-ops')) {
+            abort(403, 'Unauthorized to access ops interface');
+        }
+
+        $stickerPath = "qr-stickers/{$order->uuid}.pdf";
+
+        if (! \Illuminate\Support\Facades\Storage::disk('public')->exists($stickerPath)) {
+            Log::warning('QR sticker PDF not found', [
+                'order_uuid' => $order->uuid,
+                'path' => $stickerPath,
+            ]);
+
+            abort(404, 'QR sticker not found');
+        }
+
+        Log::info('QR sticker downloaded', [
+            'order_uuid' => $order->uuid,
+            'user_id' => auth()->id(),
+            'user_name' => auth()->user()->name,
+        ]);
+
+        return \Illuminate\Support\Facades\Storage::disk('public')->download(
+            $stickerPath,
+            "QR-{$order->order_number}.pdf"
+        );
+    }
 }