feat(backend): directory scanner — diff, error state, covers, cache sweep, redis lock

backend/internal/api/auth_test.go

@@ -15,6 +15,7 @@ import (
 	"booklib/internal/auth"
 	"booklib/internal/db"
 	"booklib/internal/redispkg"
+	"booklib/internal/scanner"
 	"booklib/internal/store"
 )
 
@@ -43,7 +44,8 @@ func setupAPI(t *testing.T) (*store.Store, http.Handler) {
 	cfg := testCfg()
 	cfg.BooksDir = filepath.Clean(os.TempDir())
 	cfg.CacheDir = t.TempDir()
-	r := NewRouter(cfg, st, redispkg.New(os.Getenv("REDIS_URL")))
+	rdb := redispkg.New(os.Getenv("REDIS_URL"))
+	r := NewRouter(cfg, st, rdb, scanner.New(st, cfg, rdb))
 	if u := os.Getenv("REDIS_URL"); u != "" { // 测试卫生: 共享 redis 上重置登录限流桶, 防跨测试累计 429
 		if opt, e := redis.ParseURL(u); e == nil {
 			rc := redis.NewClient(opt)