通用化项目结构：Blender 脚本去硬编码、config 路径占位符、layerPrefix 配置

- blender/generate_nantaizi.py → blender/generate_scene.py（去硬编码路径，
  --geojson 改为可选，--office-overrides 替代硬编码 way ID）
- blender/export_cesium.py CLI 参数改为必传，修复隐藏物体导出崩溃
- blender/README.md 重写为中文通用文档
- config/default.json 路径改为占位符，template.json 新增 blender 配置块
- scripts/build-osm2streets-qgis.js 新增 layerPrefix 配置驱动 QGIS 图层名
- package.json name → osm-gis-pipeline
- README.md 重写并增加实际运行示例

config/default.json

@@ -1,16 +1,17 @@
 {
   "qgisApp": "/Applications/QGIS.app",
-  "input": "/Users/que01/Downloads/osm.xml",
-  "outDir": "/Users/que01/Downloads/osm2streets_web_out",
-  "gpkg": "/Users/que01/Downloads/osm2streets_webstyle.gpkg",
-  "project": "/Users/que01/Downloads/osm2streets_webstyle.qgz",
-  "preview": "/Users/que01/Downloads/osm2streets_webstyle_preview.png",
+  "input": "/absolute/path/to/input.osm",
+  "outDir": "/absolute/path/to/osm2streets_web_out",
+  "gpkg": "/absolute/path/to/output.gpkg",
+  "project": "/absolute/path/to/output.qgz",
+  "preview": "/absolute/path/to/output_preview.png",
   "arrowScale": 0.8,
   "clipPad": 0.002,
   "canvasPad": 0.001,
   "previewPad": 0.0007,
   "canvasExtent": null,
   "previewExtent": null,
+  "layerPrefix": "osm2streets",
   "osm2streets": {
     "debug_each_step": false,
     "dual_carriageway_experiment": false,
@@ -18,4 +19,4 @@
     "inferred_sidewalks": true,
     "osm2lanes": true
   }
-}
+}