Import CAD projects and cad-router v1

SimpleCADAPI/docs/api/import_graph_json.md

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+# import_graph_json
+
+## API Definition
+
+```python
+def import_graph_json(json_str: str) -> OperationGraph
+```
+
+*Source: serializer.py*
+
+## Import Surface
+
+- top-level: `from simplecadapi import import_graph_json`
+
+## Description
+
+Import an OperationGraph from a JSON string.
+
+## Parameters
+
+### json_str
+
+- **Description**: JSON string to parse.
+
+## Returns
+
+Reconstructed OperationGraph.