fix: resolve all compilation errors — 0 build errors

Fixes:
- src/CMakeLists.txt: add tolerant_modeling.cpp to vde_brep (was missing)
- tests/core/test_cam_5axis.cpp: fix curves namespace, replace curves::NurbsSurface → NurbsSurface
- tests/brep/test_constraint_solver_3d.cpp: add brep_drawing.h include,
  replace core:: prefixes (core::Point3D→Point3D etc)
- src/CMakeLists.txt: revert vde_capi SHARED→STATIC (fix PIC relocation error)

Build: Docker vde-builder, 4 CPUs, 8GB, GCC 11.4 — 0 errors
Test: benchmarks timeout in container (expected), core tests pass

tests/core/test_cam_5axis.cpp

@@ -10,13 +10,14 @@
 
 using namespace vde::core;
 using namespace vde::brep;
+using namespace vde::curves;
 
 // ===========================================================================
 //  辅助函数
 // ===========================================================================
 
 /// 创建一个简单的 NURBS 平面用于测试
-static curves::NurbsSurface make_test_surface() {
+static NurbsSurface make_test_surface() {
     // 10×10 平面 (degree 1×1)
     std::vector<std::vector<Point3D>> grid(2, std::vector<Point3D>(2));
     grid[0][0] = Point3D(-5, -5, 0);
@@ -26,7 +27,7 @@ static curves::NurbsSurface make_test_surface() {
     std::vector<double> ku = {0, 0, 1, 1};
     std::vector<double> kv = {0, 0, 1, 1};
     std::vector<std::vector<double>> w(2, std::vector<double>(2, 1.0));
-    return curves::NurbsSurface(grid, ku, kv, w, 1, 1);
+    return NurbsSurface(grid, ku, kv, w, 1, 1);
 }
 
 /// 创建一个测试用的 B-Rep 方体