Refactor notification system to use HTTP POST for buzz events, updating configuration and documentation accordingly.

main/notifier.h

@@ -3,15 +3,14 @@
 #include <stdint.h>
 #include "esp_err.h"
 
-typedef enum { NOTIF_ALERT = 0, NOTIF_TEST } notif_kind_t;
-
 typedef struct {
     bool wifi_connected;
     char ip[16];
     uint32_t sent_ok, sent_failed, dropped;
     bool wifi_configured;
+    bool endpoint_configured;
 } notifier_stats_t;
 
-esp_err_t notifier_init(void);                        // Wi-Fi + network task
-bool notifier_send(notif_kind_t kind, const char *msg);   // non-blocking enqueue, false if queue full
+esp_err_t notifier_init(void);                 // Wi-Fi + event POST task
+bool notifier_send(uint32_t delay_ms);         // queue one duration event; non-blocking
 void notifier_get_stats(notifier_stats_t *out);