fix: resolve RedisCache array offset error and improve discovery diagnostics

- Fix RedisCache driver to handle MGET failures gracefully with fallback
- Add comprehensive discovery context comparison debug tools
- Identify root cause: WEB context discovery missing 166 items vs CLI
- WEB context missing RequestFactory class entirely (52 vs 69 commands)
- Improved exception handling with detailed binding diagnostics

src/Application/Api/Images/ImageApiController.php

@@ -75,7 +75,7 @@ final readonly class ImageApiController
             'file_size' => $image->fileSize,
             'hash' => $image->hash,
             'variants' => array_map(fn ($variant) => [
-                'type' => $variant->type,
+                'type' => $variant->variantType,
                 'width' => $variant->width,
                 'height' => $variant->height,
                 'path' => $variant->path,

src/Application/Api/Images/ImageSlotController.php

@@ -12,6 +12,7 @@ use App\Framework\Http\Exception\NotFound;
 use App\Framework\Http\HttpRequest;
 use App\Framework\Http\Method;
 use App\Framework\Http\Responses\JsonResponse;
+use App\Framework\Http\Status;
 
 final readonly class ImageSlotController
 {
@@ -47,7 +48,7 @@ final readonly class ImageSlotController
     public function getSlot(int $id): JsonResponse
     {
         try {
-            $slot = $this->slotRepository->findByIdWithImage($id);
+            $slot = $this->slotRepository->findByIdWithImage((string) $id);
         } catch (\RuntimeException $e) {
             throw NotFound::create(
                 ErrorCode::ENTITY_NOT_FOUND,
@@ -74,7 +75,7 @@ final readonly class ImageSlotController
     public function assignImage(int $id, HttpRequest $request): JsonResponse
     {
         try {
-            $slot = $this->slotRepository->findById($id);
+            $slot = $this->slotRepository->findById((string) $id);
         } catch (\RuntimeException $e) {
             throw NotFound::create(
                 ErrorCode::ENTITY_NOT_FOUND,
@@ -86,7 +87,7 @@ final readonly class ImageSlotController
         $imageUlid = $data['image_ulid'] ?? null;
 
         if (! $imageUlid) {
-            return new JsonResponse(['error' => 'image_ulid is required'], 400);
+            return new JsonResponse(['error' => 'image_ulid is required'], Status::BAD_REQUEST);
         }
 
         $image = $this->imageRepository->findByUlid($imageUlid);
@@ -99,7 +100,7 @@ final readonly class ImageSlotController
         }
 
         // Update slot with new image
-        $this->slotRepository->updateImageId($id, $imageUlid);
+        $this->slotRepository->updateImageId((string) $id, $imageUlid);
 
         return new JsonResponse([
             'success' => true,
@@ -115,7 +116,7 @@ final readonly class ImageSlotController
     public function removeImage(int $id): JsonResponse
     {
         try {
-            $slot = $this->slotRepository->findById($id);
+            $slot = $this->slotRepository->findById((string) $id);
         } catch (\RuntimeException $e) {
             throw NotFound::create(
                 ErrorCode::ENTITY_NOT_FOUND,
@@ -124,7 +125,7 @@ final readonly class ImageSlotController
         }
 
         // Remove image from slot
-        $this->slotRepository->updateImageId($id, '');
+        $this->slotRepository->updateImageId((string) $id, '');
 
         return new JsonResponse([
             'success' => true,