Fix: Crash on HTML response in EventRepository and others

- Fixed: Value <! DOCTYPE cannot be converted to JSONArray in EventRepository
- Fixed: Added HTML validation in UpdateManager and DeviceRegistry
- Fixed: Improved HTTP error handling in StreamUrlResolver
- Improved: Error messages in PlayerActivity
- Bumped version to 9.4.3

app/src/main/java/com/streamplayer/DeviceRegistry.java

@@ -81,6 +81,15 @@ public class DeviceRegistry {
                         throw new IOException("HTTP " + response.code());
                     }
                     String responseText = response.body().string();
+                    
+                    // Validar que no sea HTML antes de parsear
+                    if (responseText != null) {
+                        String trimmed = responseText.trim();
+                        if (trimmed.startsWith("<!") || trimmed.startsWith("<html")) {
+                            throw new IOException("El servidor devolvió HTML en lugar de JSON");
+                        }
+                    }
+                    
                     JSONObject json = new JSONObject(responseText);
                     JSONObject deviceJson = json.optJSONObject("device");
                     JSONObject verificationJson = json.optJSONObject("verification");