status: hls download stats (last segment speed, failed requests, last error)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

main/hls.h

@@ -5,6 +5,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "cJSON.h"
 #include "esp_err.h"
 
 // Receives segment data in chunks (MPEG-TS etc.). Return false to abort the segment.
@@ -13,6 +14,8 @@ typedef bool (*hls_sink_t)(const uint8_t *data, size_t len, bool segment_start);
 #define HLS_URL_MAX 384
 
 esp_err_t hls_start(hls_sink_t sink);
+// Adds status.hls: last segment download (bytes, ms, Mbit/s incl. connect + TLS), failed requests.
+void hls_status(cJSON *st);
 // The playlist URL to play ("" = none). A different URL restarts fetching with it.
 void hls_set_url(const char *url);
 // Stop fetching (current download is abandoned) until resumed. Reasons are independent: