Restore missing addIndicator function that was accidentally deleted

The addIndicator function definition was missing from the file, causing window.addIndicator
to reference itself in a circular reference. Added back the full function definition
and removed the problematic circular reference assignment.

src/api/dashboard/static/js/ui/indicators-panel-new.js

@@ -579,6 +579,40 @@ window.applyPresetFromWindow = function(presetId) {
     applyPreset(indicator.id, presetId);
 };
 
+function addIndicator(type) {
+    const IndicatorClass = IR?.[type];
+    if (!IndicatorClass) return;
+    
+    const id = `${type}_${nextInstanceId++}`;
+    const instance = new IndicatorClass({ type, params: {}, name: '' });
+    const metadata = instance.getMetadata();
+    
+    const params = {
+        _lineType: 'solid',
+        _lineWidth: 2
+    };
+    metadata.plots.forEach((plot, idx) => {
+        params[`_color_${idx}`] = plot.color || getDefaultColor(activeIndicators.length + idx);
+    });
+    metadata.inputs.forEach(input => {
+        params[input.name] = input.default;
+    });
+    
+    activeIndicators.push({
+        id,
+        type,
+        name: metadata.name,
+        params,
+        plots: metadata.plots,
+        series: [],
+        visible: true
+    });
+    
+    configuringId = id;
+    renderIndicatorPanel();
+    drawIndicatorsOnChart();
+};
+
 function saveUserPresets() {
     localStorage.setItem('indicator_presets', JSON.stringify(userPresets));
 }
@@ -751,7 +785,6 @@ window.applyIndicatorConfig = function() {
 };
 
 // Assign functions to window for backward compatibility
-window.addIndicator = window.addIndicator || addIndicator;
 window.removeIndicator = function() {
     if (!configuringId) return;
     removeIndicatorById(configuringId);