Add H2C dual-nozzle and multi-AMS-type support

Schema (migration 0004):
- PrinterMetrics: nozzle_temp_left, nozzle_target_temp_left,
  nozzle_diameter_left, nozzle_type_left (all nullable)
- Filament: ams_unit_id (nullable int), ams_type (AMS/AMS 2 Pro/AMS HT)
- AMS_INFO_TO_TYPE map and AMS_TYPE_CHOICES on models

Parser (mqtt_client.py):
- Decode bit-packed temps from device.extruder.info[] for left/right nozzle
- Emit per-nozzle fields in get_snapshot(); legacy keys mirror right side
- AMS unit type from info code per unit dict

Collector (bambu_collector.py):
- Write left-nozzle fields to PrinterMetrics
- Set ams_unit_id + ams_type on Filament records
- Fix: poll MQTTClient.connected before pushall (not BambuPrinter._connected)
- Add 5s post-pushall wait in --once mode so response arrives before collect

Views: API and dashboard include left-nozzle series; is_dual_nozzle flag
Templates: dual-nozzle cards + chart; AMS-type badge + filter on filament list
Charts: left nozzle temp chart with conditional render
Forms: fix tray_id max=3 → max=15; add ams_unit_id, ams_type fields

bambu_run/static/bambu_run/js/printer_charts.js

@@ -1,7 +1,7 @@
 // 3D Printer Charts Initialization and Management
 // Chart.js implementation for printer metrics visualization
 
-let nozzleTempChart, bedTempChart, printProgressChart, fanSpeedsChart;
+let nozzleTempChart, nozzleTempLeftChart, bedTempChart, printProgressChart, fanSpeedsChart;
 let wifiSignalChart, amsConditionsChart, layerProgressChart, filamentTimelineChart;
 
 function showNoDataMessage(canvasId) {
@@ -75,6 +75,50 @@ function initPrinterCharts(printerData, apiUrl) {
         options: getTemperatureChartOptions(tickColor, gridColor, '°C')
     });
 
+    // Initialize Left Nozzle Temperature Chart (H2C-class dual-nozzle).
+    // Mounted only when the canvas exists AND the API returned non-null
+    // left-side samples — single-nozzle printers leave the column NULL.
+    const nozzleLeftCanvas = document.getElementById('nozzleTempLeftChart');
+    const hasLeftData = Array.isArray(printerData.nozzle_temp_left)
+        && printerData.nozzle_temp_left.some(v => v !== null && v !== undefined);
+    if (nozzleLeftCanvas && hasLeftData) {
+        const nozzleLeftCtx = nozzleLeftCanvas.getContext('2d');
+        nozzleTempLeftChart = new Chart(nozzleLeftCtx, {
+            type: 'line',
+            data: {
+                labels: printerData.timestamps,
+                datasets: [
+                    {
+                        label: 'Actual Temp (Left)',
+                        data: printerData.nozzle_temp_left,
+                        borderColor: 'rgb(54, 162, 235)',
+                        backgroundColor: 'rgba(54, 162, 235, 0.1)',
+                        tension: 0.3,
+                        borderWidth: 2,
+                        pointRadius: 0,
+                        pointHoverRadius: 3,
+                        spanGaps: true
+                    },
+                    {
+                        label: 'Target Temp (Left)',
+                        data: printerData.nozzle_target_temp_left,
+                        borderColor: 'rgb(153, 102, 255)',
+                        backgroundColor: 'rgba(153, 102, 255, 0.05)',
+                        borderDash: [5, 5],
+                        tension: 0.3,
+                        borderWidth: 2,
+                        pointRadius: 0,
+                        pointHoverRadius: 3,
+                        spanGaps: true
+                    }
+                ]
+            },
+            options: getTemperatureChartOptions(tickColor, gridColor, '°C')
+        });
+    } else if (nozzleLeftCanvas) {
+        showNoDataMessage('nozzleTempLeftChart');
+    }
+
     // Initialize Bed Temperature Chart
     const bedCtx = document.getElementById('bedTempChart').getContext('2d');
     bedTempChart = new Chart(bedCtx, {
@@ -702,7 +746,7 @@ function updateChartTheme() {
 
     // Update all charts
     const charts = [
-        nozzleTempChart, bedTempChart, printProgressChart, fanSpeedsChart,
+        nozzleTempChart, nozzleTempLeftChart, bedTempChart, printProgressChart, fanSpeedsChart,
         wifiSignalChart, amsConditionsChart, layerProgressChart, filamentTimelineChart
     ];
 
@@ -804,7 +848,7 @@ function applyDateSeparatorsToAllPrinterCharts(timestamps, dates) {
     const sepAnnotations = buildDateSeparatorAnnotations(timestamps, dates);
 
     const charts = [
-        nozzleTempChart, bedTempChart, printProgressChart, fanSpeedsChart,
+        nozzleTempChart, nozzleTempLeftChart, bedTempChart, printProgressChart, fanSpeedsChart,
         wifiSignalChart, amsConditionsChart, layerProgressChart, filamentTimelineChart
     ];
 

bambu_run/static/bambu_run/js/printer_charts_control.js

@@ -200,6 +200,13 @@ function updateAllPrinterCharts(data) {
         { data: data.nozzle_target_temp, datasetIndex: 1 }
     ]);
 
+    if (typeof nozzleTempLeftChart !== 'undefined' && nozzleTempLeftChart) {
+        updateChartData(nozzleTempLeftChart, data.timestamps, [
+            { data: data.nozzle_temp_left || [], datasetIndex: 0 },
+            { data: data.nozzle_target_temp_left || [], datasetIndex: 1 }
+        ]);
+    }
+
     updateChartData(bedTempChart, data.timestamps, [
         { data: data.bed_temp, datasetIndex: 0 },
         { data: data.bed_target_temp, datasetIndex: 1 }
@@ -269,7 +276,7 @@ function addProjectMarkersToCharts(markers, timestamps) {
     console.log('Adding project markers:', markers);
 
     const charts = [
-        nozzleTempChart, bedTempChart, printProgressChart, fanSpeedsChart,
+        nozzleTempChart, nozzleTempLeftChart, bedTempChart, printProgressChart, fanSpeedsChart,
         wifiSignalChart, amsConditionsChart, layerProgressChart, filamentTimelineChart
     ];
 
@@ -400,7 +407,7 @@ function resetPrinterControls() {
 
     // Clear annotations and reload with original data
     const charts = [
-        nozzleTempChart, bedTempChart, printProgressChart, fanSpeedsChart,
+        nozzleTempChart, nozzleTempLeftChart, bedTempChart, printProgressChart, fanSpeedsChart,
         wifiSignalChart, amsConditionsChart, layerProgressChart, filamentTimelineChart
     ];