Add relay and temperature configuration to web UI

firmware/esp32/overland-controller/overland-controller.ino

@@ -50,6 +50,10 @@ input{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px;ba
 .list{display:grid;gap:8px;margin-top:12px}
 .item{display:flex;justify-content:space-between;gap:8px;background:#0f151d;border:1px solid var(--line);border-radius:12px;padding:10px}
 .btnrow{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}
+.configrow{display:grid;grid-template-columns:90px 1fr 90px;gap:8px;align-items:center;background:#0f151d;border:1px solid var(--line);border-radius:12px;padding:10px}
+.configrow label{color:var(--muted);font-size:12px}
+.configrow input[type="checkbox"]{width:auto}
+.configrow input{margin:0}
 .kpi{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}
 .kpi div{background:#0f151d;border:1px solid var(--line);border-radius:12px;padding:10px}
 .kpi .num{font-size:20px;font-weight:800;margin-top:4px}
@@ -148,6 +152,23 @@ input{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px;ba
         </div>
       </section>
 
+      <section class="card span12">
+        <div class="label">Relay Config</div>
+        <div class="sub">Rename relay outputs. IDs stay fixed for API/UART compatibility.</div>
+        <div class="list" id="relayConfigList"></div>
+        <button onclick="saveRelayConfig()">Save Relay Names</button>
+      </section>
+
+      <section class="card span12">
+        <div class="label">Temperature Sensor Config</div>
+        <div class="sub">Set how many temp sensors are enabled and rename each slot.</div>
+        <div class="list">
+          <input id="tempEnabledCount" placeholder="Enabled sensor count, 0-8" inputmode="numeric">
+          <div id="tempConfigList" class="list"></div>
+          <button onclick="saveTempConfig()">Save Temperature Config</button>
+        </div>
+      </section>
+
       <section class="card span12">
         <div class="label">System</div>
         <div class="row"><span class="muted">Firmware</span><span class="v" id="fw">--</span></div>
@@ -252,7 +273,100 @@ function render(data){
   $("apIp").textContent=n.ap_ip||"--";
   $("fw").textContent=(s.firmware_name||"--")+" "+(s.firmware_version||"");
   $("uptime").textContent=(s.uptime_seconds||0)+" sec";
+  renderConfigControls(data);
 }
+
+function renderConfigControls(data){
+  const cfg=data.config||{};
+  const relays=cfg.relays||[];
+  const temps=cfg.temperature_sensors||[];
+
+  const relayBox=$("relayConfigList");
+  if(relayBox){
+    relayBox.innerHTML=relays.map((r,i)=>`
+      <div class="configrow">
+        <label>${r.id}</label>
+        <input id="relayName${i}" value="${r.name||""}" placeholder="Relay name">
+        <label>${r.enabled?"Enabled":"Disabled"}</label>
+      </div>`).join("");
+  }
+
+  const tempCount=$("tempEnabledCount");
+  if(tempCount){
+    tempCount.value=temps.filter(t=>t.enabled).length;
+  }
+
+  const tempBox=$("tempConfigList");
+  if(tempBox){
+    tempBox.innerHTML=temps.map((t,i)=>`
+      <div class="configrow">
+        <label>${t.id}</label>
+        <input id="tempName${i}" value="${t.name||""}" placeholder="Temp name">
+        <label>
+          <input id="tempEnabled${i}" type="checkbox" ${t.enabled?"checked":""}>
+          On
+        </label>
+      </div>`).join("");
+  }
+}
+
+async function saveRelayConfig(){
+  const r=await fetch("/status",{cache:"no-store"});
+  const data=await r.json();
+  const relays=data.config?.relays||[];
+
+  for(let i=0;i<relays.length;i++){
+    const name=$("relayName"+i)?.value.trim();
+    if(!name) continue;
+
+    await fetch("/config/relay",{
+      method:"POST",
+      headers:{"Content-Type":"application/json"},
+      body:JSON.stringify({
+        id:relays[i].id,
+        name:name,
+        enabled:relays[i].enabled
+      })
+    });
+  }
+
+  await fetch("/config/save",{method:"POST"});
+  await load();
+  alert("Relay names saved");
+}
+
+async function saveTempConfig(){
+  const r=await fetch("/status",{cache:"no-store"});
+  const data=await r.json();
+  const temps=data.config?.temperature_sensors||[];
+
+  let count=parseInt($("tempEnabledCount")?.value||"0",10);
+  if(isNaN(count)) count=0;
+  if(count<0) count=0;
+  if(count>temps.length) count=temps.length;
+
+  for(let i=0;i<temps.length;i++){
+    const name=$("tempName"+i)?.value.trim() || temps[i].name || temps[i].id;
+    const manual=$("tempEnabled"+i)?.checked;
+    const enabled=(i<count) || manual;
+
+    await fetch("/config/temp",{
+      method:"POST",
+      headers:{"Content-Type":"application/json"},
+      body:JSON.stringify({
+        id:temps[i].id,
+        name:name,
+        address:temps[i].address||"",
+        enabled:enabled
+      })
+    });
+  }
+
+  await fetch("/config/save",{method:"POST"});
+  await load();
+  alert("Temperature config saved");
+}
+
 async function loadWifiConfig(){
   try{
     const r=await fetch("/config/wifi",{cache:"no-store"});