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/networking/webserver.cpp

@@ -17,12 +17,12 @@
 #include "../global_data/global_data.h"
 #include "../tools/tools.h"
 #include "../tools/readers_writer_lock.h"
+#include "../tools/ota.h"
 #include "../global_data/defines.h"
 #include "json_builder.h"
 
 extern Preferences prefs;
 
-AsyncWebSocket webSocket("/webSocket");
 AsyncWebServer server(80);
 
 
@@ -49,7 +49,7 @@ ReadersWriterLock otaStatusLock;
  * @brief Sets up all routes for the webserver.
  * 
  * Configures routes for serving HTML pages, handling form submissions,
- * REST API endpoints, WebSocket connections, and static assets.
+ * REST API endpoints and static assets.
  * 
  * @note Calls setup_api_endpoints() to configure API-specific routes.
  */
@@ -74,8 +74,6 @@ void setup_routes() {
     });
     
     setup_api_endpoints();
-    webSocket.onEvent(onWsEvent);
-    server.addHandler(&webSocket);
 
     server.on("/chota.css", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/chota.css", "text/css", false); });
     server.on("/gauge.js", HTTP_GET, [](AsyncWebServerRequest* request) { request->send(LittleFS, "/gauge.js", "application/javascript", false); });
@@ -331,7 +329,8 @@ void webserver_task(void *pvParameters) {
     local_ota_status.current_version = {0, 0, 0};
     local_ota_status.latest_version = {0, 0, 0};
     local_ota_status.update_progress = -1;
-    local_ota_status.update_url = "UNKNOWN";
+    strncpy(local_ota_status.update_url, "UNKNOWN", sizeof(local_ota_status.update_url) - 1);
+    local_ota_status.update_url[sizeof(local_ota_status.update_url) - 1] = '\0';
     rwLockReleaseWrite(&otaStatusLock);
     
     LOG(ELOG_LEVEL_DEBUG, "Starting webserver");