ViewDesignEngine
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feat: GMP 精确算术后端 + 可插拔谓词接口
新增:
- include/vde/foundation/exact_predicates_gmp.h: GMP 精确谓词
- orient_2d/3d, in_circle 完全精确（mpq_class 有理数）
- 零舍入误差，任意精度
- include/vde/foundation/predicates.h: 统一谓词接口
- Predicates<T> 编译期选择后端
- VDE_USE_GMP=ON → GMP, OFF → 自适应 double
- 便捷函数: orient(), in_circle()
- cmake/FindGMP.cmake: GMP 查找模块
- CMake: -DVDE_USE_GMP=ON 启用 GMP 精确模式
- AdaptiveDouble 包装器: 统一后端接口
使用:
cmake -DVDE_USE_GMP=ON .. # 完全精确模式
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