chore(test): drop quadrature API regression file

Delete outdated API smoke tests for retired quadrature entry points.

- Delete `test/quadrature/test_api.jl`.

test/quadrature/test_api.jl

@@ -1,79 +0,0 @@
-# This file is a part of JuliaFEM.
-# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md
-
-@testset "API Types and Interface" begin
-
-    @testset "QuadraturePoint construction" begin
-        # Test 1D point
-        qp1 = QuadraturePoint(Vec{1}(0.5), 1.0)
-        @test qp1.coords isa Vec{1,Float64}
-        @test qp1.coords[1] == 0.5
-        @test qp1.weight == 1.0
-
-        # Test 2D point
-        qp2 = QuadraturePoint(Vec{2}(0.5, 0.25), 0.5)
-        @test qp2.coords isa Vec{2,Float64}
-        @test qp2.coords[1] == 0.5
-        @test qp2.coords[2] == 0.25
-        @test qp2.weight == 0.5
-
-        # Test 3D point
-        qp3 = QuadraturePoint(Vec{3}(0.5, 0.25, 0.125), 0.25)
-        @test qp3.coords isa Vec{3,Float64}
-        @test qp3.coords[1] == 0.5
-        @test qp3.coords[2] == 0.25
-        @test qp3.coords[3] == 0.125
-        @test qp3.weight == 0.25
-    end
-
-    @testset "GaussLegendre type" begin
-        gl1 = GaussLegendre{1}()
-        @test gl1 isa AbstractQuadratureRule
-
-        gl2 = GaussLegendre{2}()
-        @test gl2 isa AbstractQuadratureRule
-
-        gl2b = GaussLegendre{2,:B}()
-        @test gl2b isa AbstractQuadratureRule
-    end
-
-    @testset "get_quadrature_points return type" begin
-        # Test that return type is SVector
-        points_tri = get_quadrature_points(Triangle, GaussLegendre{2}())
-        @test points_tri isa SVector
-        @test eltype(points_tri) <: QuadraturePoint{2}
-        @test length(points_tri) == 3
-
-        points_hex = get_quadrature_points(Hexahedron, GaussLegendre{2}())
-        @test points_hex isa SVector
-        @test eltype(points_hex) <: QuadraturePoint{3}
-        @test length(points_hex) == 8
-    end
-
-    @testset "default_quadrature" begin
-        # Level 1: From basis order only
-        rule1 = default_quadrature(1)
-        @test rule1 isa GaussLegendre{2}
-
-        rule2 = default_quadrature(2)
-        @test rule2 isa GaussLegendre{3}
-
-        # Level 2: From topology + basis order
-        rule_hex = default_quadrature(Hexahedron, 1)
-        @test rule_hex isa GaussLegendre{2}
-    end
-
-    @testset "npoints function" begin
-        # Test that npoints returns correct count
-        @test npoints(Triangle, GaussLegendre{1}()) == 1
-        @test npoints(Triangle, GaussLegendre{2}()) == 3
-        @test npoints(Triangle, GaussLegendre{3}()) == 4
-
-        @test npoints(Hexahedron, GaussLegendre{1}()) == 1
-        @test npoints(Hexahedron, GaussLegendre{2}()) == 8
-        @test npoints(Hexahedron, GaussLegendre{3}()) == 27
-
-        @test npoints(Quadrilateral, GaussLegendre{2}()) == 4
-        @test npoints(Quadrilateral, GaussLegendre{3}()) == 9
-    end
-end