Add configurable DS18B20 temperature probe support

docs/API.md

@@ -538,3 +538,58 @@ Runtime behavior:
     AP always remains enabled.
     STA tries saved networks by priority.
     If STA disconnects, saved networks are retried every 30 seconds.
+
+---
+
+# Temperature Probe Setup API
+
+## Scan Temperature Sensors
+
+    POST /temps/scan
+
+Response:
+
+    {
+      "type": "temp_scan_response",
+      "ok": true,
+      "devices": [
+        {
+          "index": 1,
+          "address": "28:AA:BB:CC:DD:EE:FF:00"
+        }
+      ]
+    }
+
+## Assign Temperature Sensor
+
+    POST /temps/assign
+
+Request:
+
+    {
+      "id": "temp_1",
+      "index": 1
+    }
+
+Alternative request:
+
+    {
+      "slot": 1,
+      "index": 1
+    }
+
+## Clear Temperature Sensor
+
+    POST /temps/clear
+
+Request:
+
+    {
+      "id": "temp_1"
+    }
+
+Alternative request:
+
+    {
+      "slot": 1
+    }