fix:법인도장 업로드를 base64 방식으로 변경 (PHP upload_max_filesize 제한 우회)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Http/Controllers/ESign/EsignApiController.php

@@ -54,11 +54,15 @@ public function getStamp(): JsonResponse
     public function uploadStamp(Request $request): JsonResponse
     {
         $request->validate([
-            'stamp_image' => 'required|image|max:5120',
+            'stamp_image_data' => 'required|string',
         ]);
 
         $tenantId = session('selected_tenant_id', 1);
-        $file = $request->file('stamp_image');
+        $imageData = base64_decode($request->input('stamp_image_data'));
+
+        if (!$imageData) {
+            return response()->json(['success' => false, 'message' => '이미지 데이터가 올바르지 않습니다.'], 422);
+        }
 
         $path = "esign/{$tenantId}/stamps/company_stamp.png";
 
@@ -67,7 +71,7 @@ public function uploadStamp(Request $request): JsonResponse
             Storage::disk('local')->delete($path);
         }
 
-        Storage::disk('local')->put($path, file_get_contents($file->getRealPath()));
+        Storage::disk('local')->put($path, $imageData);
 
         TenantSetting::updateOrCreate(
             [