Programm architecture simplified so that the EDA can now run individually without generation of .gds file

backend/routed_layout_preview.py

@@ -5,11 +5,12 @@
 # Organization : OptiHK Limited
 # -----------------------------------------------------------------------------
 import os
-import sys
 import tempfile
 
 import yaml
 
+from router_dependency import require_router_stack
+
 
 def create_routed_layout_svg(
     yaml_content: str,
@@ -20,15 +21,11 @@ def create_routed_layout_svg(
     prefer_full_gds: bool = False,
 ) -> str:
     """Create an SVG preview from routed GDS geometry generated by mxpic_router."""
+    require_router_stack(require_gdstk=True)
     import gdstk
 
     layout = yaml.safe_load(yaml_content) or {}
     cell_name = str(layout.get("name") or "layout")
-    # mxpic_router is kept as a sibling repository, so the backend adds it to
-    # sys.path only when the local checkout is available.
-    router_root = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", "mxpic_router"))
-    if os.path.isdir(router_root) and router_root not in sys.path:
-        sys.path.insert(0, router_root)
     from mxpic_router import build_project_gds
 
     os.makedirs(os.path.dirname(output_path), exist_ok=True)