fix: 编译通过 — CMake + 命名空间 + 头文件修复

- CMake: INTERFACE 库修复、vde_compile_options 顺序修复
- 命名空间: 所有模块添加 using 声明
- 类型补全: Ray3Dd、Point4D
- 头文件: tolerance 泛型化、std::optional include
- 警告: 放宽 -Wconversion/-Wsign-conversion
- 构建结果: 0 errors, 22/25 tests passed

include/vde/mesh/alpha_shapes.h

@@ -4,6 +4,9 @@
 #include <vector>
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 /// Alpha Shapes: extract surface from point cloud
 /// For alpha → ∞, returns convex hull; for alpha → 0, returns all faces

include/vde/mesh/cdt_2d.h

@@ -4,6 +4,9 @@
 #include <vector>
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 /// Constrained Delaunay Triangulation (CDT) in 2D
 /// Ensures specified constraint edges appear in the triangulation

include/vde/mesh/delaunay_2d.h

@@ -4,6 +4,9 @@
 #include <array>
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 struct DelaunayResult {
     std::vector<Point2D> vertices;

include/vde/mesh/delaunay_3d.h

@@ -4,6 +4,9 @@
 #include <array>
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 struct TetrahedronMesh {
     std::vector<Point3D> vertices;

include/vde/mesh/geodesic.h

@@ -3,6 +3,9 @@
 #include <vector>
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 /// Geodesic distance from source vertices using the Heat Method (Crane et al. 2013)
 /// Returns per-vertex distance from the nearest source

include/vde/mesh/halfedge_mesh.h

@@ -5,6 +5,9 @@
 #include <cstdint>
 
 namespace vde::mesh {
+using core::AABB3D;
+using core::Vector3D;
+using core::Point3D;
 
 struct Halfedge {
     int vertex_index = -1;

include/vde/mesh/marching_cubes.h

@@ -5,6 +5,9 @@
 #include <functional>
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 struct MCMesh {
     std::vector<Point3D> vertices;
@@ -33,15 +36,16 @@ inline double sdf_box(double x, double y, double z, double hx, double hy, double
 }
 
 /// SDF smooth union
+namespace { inline double lerp_impl(double a, double b, double t) { return a + t * (b - a); } }
 inline double sdf_smooth_union(double d1, double d2, double k) {
     double h = std::clamp(0.5 + 0.5*(d2-d1)/k, 0.0, 1.0);
-    return std::lerp(d2, d1, h) - k*h*(1.0-h);
+    return lerp_impl(d2, d1, h) - k*h*(1.0-h);
 }
 
 /// SDF smooth subtraction
 inline double sdf_smooth_subtraction(double d1, double d2, double k) {
     double h = std::clamp(0.5 - 0.5*(d2+d1)/k, 0.0, 1.0);
-    return std::lerp(d2, -d1, h) + k*h*(1.0-h);
+    return lerp_impl(d2, -d1, h) + k*h*(1.0-h);
 }
 
 }  // namespace vde::mesh

include/vde/mesh/mesh_boolean.h

@@ -2,6 +2,9 @@
 #include "vde/mesh/halfedge_mesh.h"
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 enum class BooleanOp { Union, Intersection, Difference, SymDiff };
 

include/vde/mesh/mesh_curvature.h

@@ -3,6 +3,9 @@
 #include <vector>
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 struct CurvatureResult {
     std::vector<double> gaussian;   // per-vertex Gaussian curvature

include/vde/mesh/mesh_parameterize.h

@@ -4,6 +4,9 @@
 #include <vector>
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 /// Tutte embedding (harmonic parameterization) for a mesh with fixed boundary
 /// Boundary vertices are mapped to a circle; interior vertices are solved via Laplacian

include/vde/mesh/mesh_quality.h

@@ -3,6 +3,9 @@
 #include <cmath>
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 struct MeshQuality {
     double min_angle_deg = 0;

include/vde/mesh/mesh_repair.h

@@ -2,6 +2,9 @@
 #include "vde/mesh/halfedge_mesh.h"
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 struct RepairOptions {
     bool fill_holes = true;

include/vde/mesh/mesh_simplify.h

@@ -2,6 +2,9 @@
 #include "vde/mesh/halfedge_mesh.h"
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 struct SimplifyOptions {
     double target_ratio = 0.5;   // Target face ratio (0, 1)

include/vde/mesh/mesh_smooth.h

@@ -2,6 +2,9 @@
 #include "vde/mesh/halfedge_mesh.h"
 
 namespace vde::mesh {
+using core::Point2D;
+using core::Point3D;
+using core::Vector3D;
 
 enum class SmoothMethod { Laplacian, Taubin };