Merge main into 0.8.0-redis: resolve conflicts

Merged the following features from main:
- Dynamic Client Registration (RFC 7591)
- Sharded cache and CPU spike prevention
- Documentation updates (CNAME, index.html)

Resolved conflicts in:
- settings.go: Combined Redis config with Dynamic Client Registration config
- universal_cache_singleton.go: Merged Redis backend support with consolidated cleanup

Both features now work together:
- Redis distributed caching with circuit breaker and health checks
- Consolidated cleanup goroutine (reduces from 7 to 1)
- SkipAutoCleanup flag honored for all cache types

universal_cache.go

@@ -37,6 +37,11 @@ type UniversalCacheConfig struct {
 	Logger            *Logger
 	Strategy          CacheStrategy // For backward compatibility
 
+	// SkipAutoCleanup skips starting the per-cache cleanup goroutine.
+	// Use this when cleanup is managed externally (e.g., by UniversalCacheManager)
+	// to reduce goroutine count and consolidate cleanup operations.
+	SkipAutoCleanup bool
+
 	// Type-specific configurations
 	TokenConfig    *TokenCacheConfig
 	MetadataConfig *MetadataCacheConfig
@@ -158,8 +163,12 @@ func createUniversalCache(config UniversalCacheConfig) *UniversalCache {
 		cancel:  cancel,
 	}
 
-	// Start cleanup routine
-	cache.startCleanup()
+	// Start cleanup routine only if not skipped
+	// When cleanup is managed externally (e.g., by UniversalCacheManager),
+	// skip per-cache cleanup to reduce goroutine count
+	if !config.SkipAutoCleanup {
+		cache.startCleanup()
+	}
 
 	return cache
 }