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

main/Kconfig.projbuild

@@ -91,20 +91,18 @@ menu "Door Buzzer Detector"
             default ""
     endmenu
 
-    menu "ntfy notifications"
-        config BUZZ_NTFY_SERVER
-            string "ntfy server URL"
-            default "https://ntfy.sh"
-        config BUZZ_NTFY_TOPIC
-            string "Alert topic (anyone who knows it can read it: make it unguessable)"
-            default "change-me-door-buzzer"
-        config BUZZ_NTFY_HB_TOPIC
-            string "Heartbeat topic"
-            default "change-me-door-buzzer-heartbeat"
-        config BUZZ_HEARTBEAT_HOURS
-            int "Heartbeat interval in hours (0 = disabled)"
-            default 0
-            range 0 720
+    menu "Buzz event HTTP endpoint"
+        config BUZZ_EVENT_URL
+            string "POST endpoint URL"
+            default ""
+            help
+                Full URL for the JSON event POST. Use an address reachable from the ESP32;
+                localhost refers to the ESP32 itself, not your development computer.
+        config BUZZ_EVENT_SECRET
+            string "Event secret key"
+            default ""
+            help
+                Secret sent in the JSON request body. Keep it private and configure it for the endpoint.
     endmenu
 
 endmenu