Refactor Redis configuration handling in KV cache scorer

Replace direct Redis address assignment with URL parsing for better configuration management. This ensures proper error handling and compatibility with Redis connection options. Added Redis client dependency to facilitate this change.

Author: relyt0925

pkg/scheduling/plugins/scorer/kvcache-aware.go

@@ -3,6 +3,7 @@ package scorer
 import (
 	"context"
 	"fmt"
+	"github.com/redis/go-redis/v9"
 	"os"
 
 	kvcache "github.com/llm-d/llm-d-kv-cache-manager/pkg/kv-cache"
@@ -37,7 +38,12 @@ func NewKVCacheAwareScorer(ctx context.Context) (plugins.Scorer, error) {
 
 	redisAddr := os.Getenv(kvCacheRedisEnvVar)
 	if redisAddr != "" {
-		config.KVBlockIndexerConfig.RedisAddr = redisAddr
+		redisOpt, err := redis.ParseURL(kvCacheRedisEnvVar)
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse redisURL: %w", err)
+		}
+
+		config.KVBlockIndexerConfig.RedisOpt = redisOpt
 	} else {
 		return nil, fmt.Errorf("environment variable %s is not set", kvCacheRedisEnvVar)
 	}