refactor: migrate from SPIFFS to LittleFS for file handling

platformio.ini

@@ -33,7 +33,8 @@ lib_deps =
     digitaldragon/SSLClient @ ^1.3.2
     
 ; Enable SPIFFS upload
-board_build.filesystem = spiffs
+#board_build.filesystem = spiffs
+board_build.filesystem = littlefs
 ; Update partition settings
 board_build.partitions = partitions.csv
 board_upload.flash_size = 4MB
@@ -44,13 +45,13 @@ build_flags =
     -Os
     -ffunction-sections
     -fdata-sections
-    -DNDEBUG
+    #-DNDEBUG
     -mtext-section-literals
     -DVERSION=\"${common.version}\"
     -DASYNCWEBSERVER_REGEX
-    -DCORE_DEBUG_LEVEL=3
+    #-DCORE_DEBUG_LEVEL=3
     -DCONFIG_ARDUHAL_LOG_COLORS=1
-    -DOTA_DEBUG=1
+    #-DOTA_DEBUG=1
     -DCONFIG_OPTIMIZATION_LEVEL_DEBUG=1
     -DBOOT_APP_PARTITION_OTA_0=1
     -DCONFIG_LWIP_TCP_MSL=60000