gjm 9b8a2329df feat(heatmap): 实体分布热力图(占用网格 + 聚类 + 可视化)
- 新增 dwg_review/heatmap.py:entity_boxes / build_grid(counts+coverage)/ occupied_cells /
  cluster_cells(4-连通,可选膨胀合并)/ grid_to_windows / grid_stats / render_overlay
- drop_oversized:过滤 bbox 占满图框的实体(实测每框恰 1 个,即图框块),否则热力图全满
- 新增 verify_heatmap.py:取实体 bbox(分页)-> 建网格 -> 聚类 -> 渲染 PNG,并缓存 bbox JSON 供离线调参
- 新增 tests/test_heatmap.py(22 项)
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