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
+    }

docs/SERIAL_COMMANDS.md

@@ -414,3 +414,41 @@ Attempt STA WiFi connection using saved networks by priority.
 AP remains available at:
 
     192.168.4.1
+
+---
+
+# Temperature Probe Setup
+
+## scan temps
+
+Scans the DS18B20 1-Wire bus and prints detected sensor addresses.
+
+Example:
+
+    scan temps
+
+## assign temp <slot> <number>
+
+Assigns a detected physical sensor to a configured temp slot.
+
+Example:
+
+    assign temp 1 1
+    assign temp 2 2
+    save
+
+## clear temp <slot>
+
+Clears and disables a configured temp slot.
+
+Example:
+
+    clear temp 1
+
+Wiring reminder:
+
+    DS18B20 red    -> 3.3V
+    DS18B20 black  -> GND
+    DS18B20 yellow -> GPIO4
+
+A single 4.7k resistor is required between 3.3V and GPIO4/data.

docs/UART_PROTOCOL.md

@@ -232,3 +232,37 @@ Preferred response:
     {"type":"config_wifi","networks":[{"ssid":"Starlink","password":"password","priority":1},{"ssid":"Home WiFi","password":"password","priority":2}]}
 
 Lower priority numbers are tried first.
+
+---
+
+# Temperature Probe Setup
+
+## Scan Temperature Sensors
+
+Pico sends:
+
+    {"type":"scan_temps"}
+
+ESP32 responds:
+
+    {"type":"temp_scan_response","ok":true,"devices":[{"index":1,"address":"28:AA:BB:CC:DD:EE:FF:00"}]}
+
+## Assign Temperature Sensor
+
+Pico sends:
+
+    {"type":"assign_temp","id":"temp_1","index":1}
+
+Alternative:
+
+    {"type":"assign_temp","slot":1,"index":1}
+
+## Clear Temperature Sensor
+
+Pico sends:
+
+    {"type":"clear_temp","id":"temp_1"}
+
+Alternative:
+
+    {"type":"clear_temp","slot":1}