添加api调用接口

Co-authored-by: Copilot <copilot@github.com>

app/routes/main_routes.py

@@ -298,7 +298,18 @@ def preview_gcode(file_id):
     
     content = "File not found or not ready."
     line_count = 0
+    
+    time_info = "-"
+    layer1_time = "-"
+    filament_used = "-"
+    
     if os.path.exists(filepath):
+        from app.utils.gcode_parser import get_gcode_metadata
+        metadata = get_gcode_metadata(filepath)
+        time_info = metadata.get('print_time', '-')
+        layer1_time = metadata.get('first_layer_time', '-')
+        filament_used = metadata.get('filament_used', '-')
+        
         with open(filepath, 'r') as f:
             lines = f.readlines()
             line_count = len(lines)
@@ -313,7 +324,8 @@ def preview_gcode(file_id):
     configs = {c.key: c.value for c in SystemConfig.query.all()}
     offset_x = float(configs.get('offset_x', '0.0'))
     offset_y = float(configs.get('offset_y', '0.0'))
-    return render_template('slice/gcode_preview.html', file=print_file, content=content, line_count=line_count, machine_width=w, machine_depth=h, machine_height=hd, offset_x=offset_x, offset_y=offset_y)
+    return render_template('slice/gcode_preview.html', file=print_file, content=content, line_count=line_count, machine_width=w, machine_depth=h, machine_height=hd, offset_x=offset_x, offset_y=offset_y,
+                           time_info=time_info, layer1_time=layer1_time, filament_used=filament_used)
 
 @main_bp.route('/delete_file/<int:file_id>', methods=['POST'])
 @login_required