feat: 添加定时清理图像缓存的功能，以优化内存使用

handler/scoresaber/bs50.go

@@ -15,6 +15,7 @@ import (
 	"sync"
 	"time"
 
+	"git.lxtend.com/qqbot/util"
 	"github.com/fogleman/gg"
 	"github.com/nfnt/resize"
 	"golang.org/x/image/font/opentype"
@@ -25,6 +26,16 @@ var (
 	imageCacheLock sync.RWMutex
 )
 
+func init() {
+	util.AddCycleTask("bs50_image_cache_cleaner", 10*time.Minute, 10*time.Minute, func() {
+		imageCacheLock.Lock()
+		defer imageCacheLock.Unlock()
+		for k := range imageCache {
+			delete(imageCache, k)
+		}
+	})
+}
+
 func loadImageFromCache(path string) (image.Image, error) {
 	imageCacheLock.RLock()
 	if img, exists := imageCache[path]; exists {