feat: reduce default bucket capacity for rate limiting

internal/wb/rate_limiter.go

@@ -4,15 +4,16 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"github.com/redis/rueidis"
 	"net/http"
 	"sipro-mps/internal/redis"
 	"sipro-mps/pkg/utils"
 	"time"
+
+	"github.com/redis/rueidis"
 )
 
 const (
-	defaultBucketCapacity = 10            // max burst size
+	defaultBucketCapacity = 5             // max burst size
 	refillRate            = 100.0 / 60000 // 300 requests per minute → 1 token per 200ms
 	tokenTTLMillis        = 60000         // Redis key TTL: 60s
 )