Fix final 2 lint issues: goconst and gosec

GOCONST FIX:
- pkg/obcache/cache_redis_test.go: Create testKeyConst constant to avoid
  repeated string literal 'test-key' when testKey variable already exists

GOSEC FIX:
- pkg/obcache/hooks_test.go: Fix G115 integer overflow by making
  numGoroutines and numOperations constants and computing multiplication
  before int32 conversion to avoid overflow during cast

All golangci-lint issues now resolved.

Author: vnykmshr

pkg/obcache/cache_redis_test.go

@@ -8,6 +8,8 @@ import (
 	"github.com/redis/go-redis/v9"
 )
 
+const testKeyConst = "test-key"
+
 func TestCacheWithRedisStore(t *testing.T) {
 	// Create a Redis client
 	client := redis.NewClient(&redis.Options{
@@ -39,7 +41,7 @@ func TestCacheWithRedisStore(t *testing.T) {
 	defer func() { _ = cache.Close() }()
 
 	// Test basic operations
-	testKey := "test-key"
+	testKey := testKeyConst
 	testValue := "test-value"
 
 	// Test Set

pkg/obcache/hooks_test.go

@@ -170,8 +170,8 @@ func TestHookConcurrency(t *testing.T) {
 
 	// Concurrent cache operations to trigger hooks
 	var wg sync.WaitGroup
-	numGoroutines := 50
-	numOperations := 100
+	const numGoroutines = 50
+	const numOperations = 100
 
 	wg.Add(numGoroutines)
 	for i := 0; i < numGoroutines; i++ {
@@ -191,7 +191,7 @@ func TestHookConcurrency(t *testing.T) {
 
 	wg.Wait()
 
-	expectedCalls := int32(numGoroutines) * int32(numOperations)
+	expectedCalls := int32(numGoroutines * numOperations)
 	actualCalls := atomic.LoadInt32(&hookCallCount)
 
 	if actualCalls != expectedCalls {