chore: initial commit of existing codebase

app/Http/Controllers/Purchase/PurchaseSignatureController.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Http\Controllers\Purchase;
+
+use App\Http\Controllers\Controller;
+use App\Models\PurchaseRequest;
+use App\Models\PurchaseSignature;
+use App\Services\PurchaseStageService;
+use Illuminate\Http\Request;
+
+class PurchaseSignatureController extends Controller
+{
+    public function show(PurchaseRequest $purchaseRequest)
+    {
+        $purchaseRequest->load('signature.signedBy');
+        return view('purchase.signature.show', ['request' => $purchaseRequest]);
+    }
+
+    public function store(Request $request, PurchaseRequest $purchaseRequest, PurchaseStageService $stages)
+    {
+        $validated = $request->validate([
+            'signature_image' => ['required', 'string'],
+        ]);
+
+        if ($purchaseRequest->signature) {
+            return back()->with('error', 'This request has already been signed.');
+        }
+
+        PurchaseSignature::create([
+            'purchase_request_id' => $purchaseRequest->id,
+            'signed_by'           => auth()->id(),
+            'signature_image'     => $validated['signature_image'],
+            'signed_at'           => now(),
+            'ip_address'          => $request->ip(),
+        ]);
+
+        $stages->advance($purchaseRequest);
+
+        return redirect()->route('purchase.pipeline.index')
+            ->with('success', 'Signature saved. Request moved to RFQ stage.');
+    }
+}