refactor: remove unused constants and fields

api/auth/auth.go

@@ -21,8 +21,6 @@ var (
 	ErrNotAuthenticated   = errors.New("not authenticated")
 )
 
-const bcryptCost = 12
-
 type Service struct {
 	db db.Querier
 }

api/playback/service_base.go

@@ -27,8 +27,6 @@ type Service struct {
 	db             db.Querier
 	proxyTokens    *proxyTokenSigner
 	proxyHostCache *lru.Cache[string, proxyHostCacheItem]
-
-	cacheMu           sync.RWMutex
 	showResolution    *lru.Cache[int, showResolutionCacheItem]
 	playbackDataCache *lru.Cache[string, playbackDataCacheItem]
 }

api/playback/service_ranking.go

@@ -87,10 +87,6 @@ var providerPriority = map[string]int{
 	"ss-hls":  30,
 }
 
-var sourceQualityDefaults = map[string]int{
-	"auto": 240,
-}
-
 func lookupPriority(m map[string]int, key string, fallback int) int {
 	if p, ok := m[strings.ToLower(key)]; ok {
 		return p