add flac support and files management app

main/APP/app.c

@@ -41,7 +41,7 @@ static const app_entry_t s_apps[] = {
     {
         .icon       = LV_SYMBOL_AUDIO,          /* 音符：音乐播放器 */
         .title      = "MUSIC",
-        .subtitle   = "WAV files in SD /MUSIC",
+        .subtitle   = "WAV / FLAC files in SD /MUSIC",
         .mode       = APP_MODE_PLAYER,
         .enabled    = true,
         .color_from = 0x8E5BFF,
@@ -50,9 +50,9 @@ static const app_entry_t s_apps[] = {
     {
         .icon       = LV_SYMBOL_DIRECTORY,      /* 文件夹：SD 卡文件浏览 */
         .title      = "FILES",
-        .subtitle   = "Browse files on SD card",
-        .mode       = APP_MODE_NONE,
-        .enabled    = false,
+        .subtitle   = "Browse every file on SD card",
+        .mode       = APP_MODE_FILES,
+        .enabled    = true,
         .color_from = 0x31C27C,
         .color_to   = 0x1E9C6B,
     },