优化 Runtime 安装进度体验

- 状态栏与窗口强制刷新，进度更新无需移动鼠标即可实时显示
- 安装过程拆分为 12 个阶段，每段进度从 0 到 100%
- 安装阶段解析 uv 下载事件推进进度，模型下载阶段实时反映字节进度

src/snapform/operators.py

@@ -412,8 +412,20 @@ class RunJob(bpy.types.Operator):
             return
         settings = context.scene.snapform_settings
         settings.progress = float(status.get("progress", settings.progress))
-        settings.status = status.get("message", settings.status)
-        self._redraw_ui(context)
+        settings.status = self._format_status(status, settings.status)
+        self._redraw_ui(context, force=True)
+
+    def _format_status(self, status, fallback):
+        message = status.get("message", fallback)
+        stage = status.get("stage")
+        stages = status.get("stages")
+        stage_label = status.get("stage_label")
+        if not stage or not stages:
+            return message
+        stage_text = f"Step {stage}/{stages}"
+        if stage_label:
+            stage_text = f"{stage_text} {stage_label}"
+        return f"{stage_text}: {message}" if message else stage_text
 
     def _finish(self, context, job, return_code):
         settings = context.scene.snapform_settings