test(cache): reduce goroutines for race detector stability

Decrease the number of goroutines in concurrent read and write tests to 
minimize race conditions during testing. This ensures more reliable 
test results and makes it easier to identify concurrency issues.

cache/cache_test.go

@@ -337,9 +337,9 @@ func TestCache_ConcurrentReads(t *testing.T) {
 		Key:            hashedKey,
 	}
 
-	// Run concurrent reads
+	// Run concurrent reads (reduced for race detector)
 	var wg sync.WaitGroup
-	numGoroutines := 100
+	numGoroutines := 20
 
 	for i := 0; i < numGoroutines; i++ {
 		wg.Add(1)
@@ -359,7 +359,7 @@ func TestCache_ConcurrentWrites(t *testing.T) {
 	c := New(logger)
 
 	var wg sync.WaitGroup
-	numGoroutines := 50
+	numGoroutines := 10 // Reduced for race detector
 
 	// Concurrent organization additions
 	for i := 0; i < numGoroutines; i++ {
@@ -406,15 +406,16 @@ func TestCache_ConcurrentReadsAndWrites(t *testing.T) {
 	c.users["user-initial"] = []string{orgID}
 
 	var wg sync.WaitGroup
-	numReaders := 50
+	numReaders := 10 // Reduced for race detector
-	numWriters := 20
+	numWriters := 5  // Reduced for race detector
+	iterations := 3  // Reduced for race detector
 
 	// Concurrent readers
 	for i := 0; i < numReaders; i++ {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			for j := 0; j < 10; j++ {
+			for j := 0; j < iterations; j++ {
 				org := c.OrganizationByAPIKey(apiKey)
 				assert.NotNil(t, org)
 				orgs := c.OrganizationsByUser("user-initial")