refactor(ota): implement polling-based update system and fix API typo

- Fix typo in OTA update status API endpoint (/ota_udpate_status → /ota_update_status)
- Replace WebSocket-based update progress with polling mechanism
- Add OTA lifecycle callbacks (started, finished, progress, error)
- Implement check_update_task with internet connectivity verification
- Add LittleFS/SPIFFS update support
- Simplify update progress page to use 90-second delay and polling instead of real-time WebSocket updates

This refactor improves reliability by checking internet connectivity before attempting updates and simplifies the frontend by removing WebSocket complexity in favor of a timeout-based polling approach.

src/main.cpp

@@ -26,7 +26,7 @@
 #include <fetchOTA.h>
 #include "time.h"
 #include "tools/log.h"
-#include "tools/ota_handler.h"
+#include "tools/ota.h"
 #include <LittleFS.h>
 
 #include "esp_heap_caps.h"
@@ -35,8 +35,6 @@
 
 Preferences prefs;
 
-extern AsyncWebSocket webSocket;
-
 Version current_spiffs_version;
 
 // Variable to store the current state of the system
@@ -65,10 +63,6 @@ void setup()
     prefs.begin("waterlevel", false);
     Serial.begin(115200);
 
-    delay(500);
-    LOG(ELOG_LEVEL_DEBUG, "Init Sensor");
-    init_sensor();
-    
     LOG(ELOG_LEVEL_DEBUG, "Beginning LittleFS");
     LittleFS.begin(FORMAT_LITTLEFS_IF_FAILED);
 
@@ -95,9 +89,7 @@ void setup()
         xTaskCreate(collect_internal_telemetry_task, "InternalTelemetryTask", 1024 * 2, dataQueue, 1, NULL);
         xTaskCreate(display_task, "DisplayTask", 1024 * 2, NULL, 1, NULL);
         xTaskCreate(get_time_task, "GetTimeTask", 1024 * 2, NULL, 1, NULL);
-
-        delay(5000);
-        xTaskCreate(check_update_task, "CheckUpdateTask", 1024 * 6, NULL, 1, NULL);
+        xTaskCreate(check_update_task, "CheckUpdateTask", 1024 * 6, dataQueue, 1, NULL);
         xTaskCreate(webserver_task, "WebServerTask", 1024 * 4, stateForWebserverQueue, 1, NULL);
         xTaskCreate(ota_handler_task, "OTAHandlerTask", 1024 * 4, NULL, 3, NULL);
     }
@@ -141,6 +133,13 @@ void loop()
                     current_state.telemetryData.heap_used_percent, current_state.telemetryData.uptime_seconds,
                     current_state.telemetryData.temperature);
                 break;
+            case DATA_TYPE_OTA:
+                current_state.otaStatus = dataMessage.data.otaStatus;
+                LOG(ELOG_LEVEL_DEBUG, "Received OTA status: update_available=%d, current=%d.%d.%d, latest=%d.%d.%d",
+                    current_state.otaStatus.update_available,
+                    current_state.otaStatus.current_version.major, current_state.otaStatus.current_version.minor, current_state.otaStatus.current_version.patch,
+                    current_state.otaStatus.latest_version.major, current_state.otaStatus.latest_version.minor, current_state.otaStatus.latest_version.patch);
+                break;
             default:
                 LOG(ELOG_LEVEL_ERROR, "Unknown data type received");
                 break;