refactor(redis, discovery, cache): enhance validation, error handling, and class filtering

- Remove redundant fallback for `RedisConfig` key prefix to enforce explicit configuration.
- Refine `ClassExtractor` with class name validation to exclude invalid identifiers and handle creation errors.
- Improve `AttributeCache` by validating class existence before reflection, preventing unnecessary exceptions and caching empty results on failure.

src/Framework/Reflection/Cache/AttributeCache.php

@@ -47,12 +47,27 @@ final class AttributeCache implements \App\Framework\Reflection\Contracts\Reflec
     {
         $key = "{$className->getFullyQualified()}::attributes::" . ($attributeClass ?? 'all');
         if (! isset($this->attributeCache[$key])) {
-            /** @var class-string $className */
-            $className = $className->getFullyQualified();
-            $class = new \ReflectionClass($className);
-            $this->attributeCache[$key] = $attributeClass
-                ? $class->getAttributes($attributeClass)
-                : $class->getAttributes();
+            /** @var class-string $classNameString */
+            $classNameString = $className->getFullyQualified();
+            
+            try {
+                // Check if class exists before trying to reflect it
+                // This prevents ReflectionException for invalid class names (e.g., property names mistaken as classes)
+                if (! class_exists($classNameString) && ! interface_exists($classNameString) && ! trait_exists($classNameString)) {
+                    // Cache empty result to avoid repeated checks
+                    $this->attributeCache[$key] = [];
+                    return [];
+                }
+                
+                $class = new \ReflectionClass($classNameString);
+                $this->attributeCache[$key] = $attributeClass
+                    ? $class->getAttributes($attributeClass)
+                    : $class->getAttributes();
+            } catch (\ReflectionException $e) {
+                // Class doesn't exist or can't be reflected - cache empty result
+                $this->attributeCache[$key] = [];
+                return [];
+            }
         }
 
         return $this->attributeCache[$key];