feat: intégration capteur CO2 MH-Z19

- Scripts MH-Z19/get_data.py (lecture standalone) et write_data.py (écriture SQLite)
- Table data_MHZ19, config MHZ19, cleanup et service systemd (120s)
- Web UI : carte test sensors, checkbox admin, boutons database + CSV download
- SARA_send_data_v2.py non modifié (sera fait dans un second temps)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

html/sensors.html

@@ -285,6 +285,36 @@ function getNoise_values(){
             });
         }
         
+function getMHZ19_values(){
+      console.log("Data from MH-Z19 CO2 sensor:");
+      $("#loading_mhz19").show();
+
+            $.ajax({
+              url: 'launcher.php?type=mhz19',
+              dataType: 'json',
+              method: 'GET',
+              success: function(response) {
+                        console.log(response);
+                        const tableBody = document.getElementById("data-table-body_mhz19");
+                        tableBody.innerHTML = "";
+                        $("#loading_mhz19").hide();
+
+                        if (response.CO2 !== undefined) {
+                            $("#data-table-body_mhz19").append(`
+                                <tr>
+                                    <td>CO2</td>
+                                    <td>${response.CO2} ppm</td>
+                                </tr>
+                            `);
+                        }
+                    },
+                    error: function(xhr, status, error) {
+                        console.error('AJAX request failed:', status, error);
+                        $("#loading_mhz19").hide();
+                    }
+            });
+        }
+
 function getBME280_values(){
       console.log("Data from I2C BME280:");
       $("#loading_BME280").show();
@@ -462,6 +492,29 @@ error: function(xhr, status, error) {
     container.innerHTML += i2C_HTML; // Add the I2C card if condition is met
   }
 
+  //creates MH-Z19 CO2 card
+  if (config.MHZ19) {
+    const MHZ19_HTML = `
+      <div class="col-sm-3">
+        <div class="card">
+          <div class="card-header">
+            Port UART 4
+          </div>
+          <div class="card-body">
+            <h5 class="card-title">MH-Z19 CO2</h5>
+            <p class="card-text">Capteur de dioxyde de carbone.</p>
+            <button class="btn btn-primary mb-1" onclick="getMHZ19_values()" data-i18n="common.getData">Get Data</button>
+            <div id="loading_mhz19" class="spinner-border spinner-border-sm" style="display: none;" role="status"></div>
+            <table class="table table-striped-columns">
+              <tbody id="data-table-body_mhz19"></tbody>
+            </table>
+          </div>
+        </div>
+      </div>`;
+
+    container.innerHTML += MHZ19_HTML;
+  }
+
   //Si on a des SONDES ENVEA connectée il faut faire un deuxième call dans la table envea_sondes_table
   //creates ENVEA debug card
   if (config.envea) {