v1.9.10: Self Test - check sous-tension (vcgencmd get_throttled)

Ajoute un test 'Power Supply' au Self Test pour détecter une
sous-tension du Pi (cause fréquente de capteurs USB instables,
corruptions SD, reboots). Endpoint launcher.php?type=throttled
+ script power/get_throttled.py (lancé via sudo python3, déjà
whitelisté — pas de modif sudoers). Affiché en tête des résultats
et dans le rapport copiable.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

html/assets/js/selftest.js

@@ -74,6 +74,10 @@ function resetSelfTestUI() {
     </div>`;
 
   // Reset test items
+  document.getElementById('test_power_status').className = 'badge bg-secondary';
+  document.getElementById('test_power_status').textContent = 'Pending';
+  document.getElementById('test_power_detail').textContent = 'Waiting...';
+
   document.getElementById('test_wifi_status').className = 'badge bg-secondary';
   document.getElementById('test_wifi_status').textContent = 'Pending';
   document.getElementById('test_wifi_detail').textContent = 'Waiting...';
@@ -260,6 +264,59 @@ async function selfTestSequence() {
 
     await delaySelfTest(300);
 
+    // ═══════════════════════════════════════════════════════
+    // SYSTEM TEST - Power supply (under-voltage detection)
+    // ═══════════════════════════════════════════════════════
+    addSelfTestLog('');
+    addSelfTestLog('────────────────────────────────────────────────────────');
+    addSelfTestLog('SYSTEM TEST');
+    addSelfTestLog('────────────────────────────────────────────────────────');
+
+    document.getElementById('selftest_status').innerHTML = `
+      <div class="d-flex align-items-center text-primary">
+        <div class="spinner-border spinner-border-sm me-2" role="status"></div>
+        <span>Checking power supply...</span>
+      </div>`;
+
+    updateTestStatus('power', 'Testing...', 'Reading vcgencmd get_throttled...', 'bg-info');
+    addSelfTestLog('Checking power supply (under-voltage)...');
+
+    try {
+      const powerResult = await new Promise((resolve, reject) => {
+        $.ajax({
+          url: 'launcher.php?type=throttled',
+          dataType: 'json',
+          method: 'GET',
+          cache: false,
+          timeout: 10000,
+          success: function(data) { resolve(data); },
+          error: function(xhr, status, error) { reject(new Error(error || status)); }
+        });
+      });
+
+      selfTestReport.rawResponses['Power Supply'] = JSON.stringify(powerResult, null, 2);
+      addSelfTestLog(`Power response: ${JSON.stringify(powerResult)}`);
+
+      if (!powerResult.available) {
+        updateTestStatus('power', 'Warning', powerResult.error || 'vcgencmd indisponible', 'bg-warning');
+        testsFailed++;
+      } else if (powerResult.status === 'critical') {
+        updateTestStatus('power', 'Failed', powerResult.message, 'bg-danger');
+        testsFailed++;
+      } else if (powerResult.status === 'warning') {
+        updateTestStatus('power', 'Warning', powerResult.message, 'bg-warning');
+        testsFailed++;
+      } else {
+        updateTestStatus('power', 'Passed', powerResult.message || 'Alimentation OK', 'bg-success');
+        testsPassed++;
+      }
+    } catch (error) {
+      addSelfTestLog(`Power supply test error: ${error.message}`);
+      updateTestStatus('power', 'Failed', error.message, 'bg-danger');
+      selfTestReport.rawResponses['Power Supply'] = `ERROR: ${error.message}`;
+      testsFailed++;
+    }
+
     // ═══════════════════════════════════════════════════════
     // SENSOR TESTS - Test enabled sensors based on config
     // ═══════════════════════════════════════════════════════
@@ -856,6 +913,7 @@ GPS Location:     ${selfTestReport.latitude || 'N/A'}, ${selfTestReport.longitud
 
   // Add test results (sensors first, then communication)
   const testNames = {
+    power: 'Power Supply',
     npm: 'NextPM (Particles)',
     bme280: 'BME280 (Temp/Hum)',
     noise: 'Noise Sensor',