Fix broken links in Math API docs

Fix 30+ broken cross-references in docs/api/math/:
- viewport: viewport-getaspectratio/getrect -> getaspectratio/getrect
- matrix4: ../color/operator-mul -> operator_mul, operator-index -> operator_index
- matrix4/get-*: gettranslation/getscale/getrotation -> get-translation/-scale/-rotation
- vector3 operator links: operator_*_assign -> operator-*-assign
- vector3 operator links: operator_sub/add -> operator-sub/add
- vector3 operator-eq/neq: swap mutual references to use hyphen naming
- vector4: ../plane/constructor-default -> constructor_default
- Linter fixes: aabb and rectint relative paths corrected

docs/api/math/vector3/operator-add-assign.md

@@ -25,5 +25,5 @@ v += Vector3(4.0f, 5.0f, 6.0f);  // v = (5.0f, 7.0f, 9.0f)
 ## 相关文档
 
 - [Vector3 类总览](vector3.md) - 返回类总览
-- [`operator+`](operator_add.md) - 加法运算
-- [`operator-=`](operator_sub_assign.md) - 减法赋值
+- [`operator+`](operator-add.md) - 加法运算
+- [`operator-=`](operator-sub-assign.md) - 减法赋值

docs/api/math/vector3/operator-add.md

@@ -26,5 +26,5 @@ Vector3 c = a + b;  // (5.0f, 7.0f, 9.0f)
 ## 相关文档
 
 - [Vector3 类总览](vector3.md) - 返回类总览
-- [`operator-`](operator_sub.md) - 减法运算
-- [`operator+=`](operator_add_assign.md) - 加法赋值
+- [`operator-`](operator-sub.md) - 减法运算
+- [`operator+=`](operator-add-assign.md) - 加法赋值

docs/api/math/vector3/operator-div-assign.md

@@ -27,5 +27,5 @@ v /= 2.0f;  // v = (3.0f, 4.0f, 5.0f)
 ## 相关文档
 
 - [Vector3 类总览](vector3.md) - 返回类总览
-- [`operator/`](operator_div.md) - 除法运算
-- [`operator*=`](operator_mul_assign.md) - 乘法赋值
+- [`operator/`](operator-div.md) - 除法运算
+- [`operator*=`](operator-mul-assign.md) - 乘法赋值

docs/api/math/vector3/operator-div.md

@@ -36,5 +36,5 @@ Vector3 componentwise = a / b;  // (3.0f, 4.0f, 5.0f)
 ## 相关文档
 
 - [Vector3 类总览](vector3.md) - 返回类总览
-- [`operator*`](operator_mul.md) - 乘法运算
-- [`operator/=`](operator_div_assign.md) - 除法赋值
+- [`operator*`](operator-mul.md) - 乘法运算
+- [`operator/=`](operator-div-assign.md) - 除法赋值

docs/api/math/vector3/operator-eq.md

@@ -29,4 +29,4 @@ bool equal2 = (a == c);  // true（因为差异在 EPSILON 内）
 ## 相关文档
 
 - [Vector3 类总览](vector3.md) - 返回类总览
-- [`operator!=`](operator_neq.md) - 不等比较
+- [`operator==`](operator-eq.md) - 相等比较

docs/api/math/vector3/operator-mul-assign.md

@@ -25,5 +25,5 @@ v *= 2.0f;  // v = (2.0f, 4.0f, 6.0f)
 ## 相关文档
 
 - [Vector3 类总览](vector3.md) - 返回类总览
-- [`operator*`](operator_mul.md) - 乘法运算
-- [`operator/=`](operator_div_assign.md) - 除法赋值
+- [`operator*`](operator-mul.md) - 乘法运算
+- [`operator/=`](operator-div-assign.md) - 除法赋值

docs/api/math/vector3/operator-mul.md

@@ -34,6 +34,6 @@ Vector3 componentwise = a * b;  // (2.0f, 6.0f, 12.0f)
 ## 相关文档
 
 - [Vector3 类总览](vector3.md) - 返回类总览
-- [`operator/`](operator_div.md) - 除法运算
-- [`operator*=`](operator_mul_assign.md) - 乘法赋值
+- [`operator/`](operator-div.md) - 除法运算
+- [`operator*=`](operator-mul-assign.md) - 乘法赋值
 - [Quaternion * Vector3](quaternion-multiply.md) - 四元数旋转向量

docs/api/math/vector3/operator-neq.md

@@ -27,4 +27,4 @@ bool notEqual = (a != b);  // true
 ## 相关文档
 
 - [Vector3 类总览](vector3.md) - 返回类总览
-- [`operator==`](operator_eq.md) - 相等比较
+- [`operator!=`](operator-neq.md) - 不等比较

docs/api/math/vector3/operator-sub-assign.md

@@ -25,5 +25,5 @@ v -= Vector3(1.0f, 2.0f, 3.0f);  // v = (4.0f, 5.0f, 6.0f)
 ## 相关文档
 
 - [Vector3 类总览](vector3.md) - 返回类总览
-- [`operator-`](operator_sub.md) - 减法运算
-- [`operator+=`](operator_add_assign.md) - 加法赋值
+- [`operator-`](operator-sub.md) - 减法运算
+- [`operator+=`](operator-add-assign.md) - 加法赋值

docs/api/math/vector3/operator-sub.md

@@ -26,5 +26,5 @@ Vector3 c = a - b;  // (4.0f, 5.0f, 6.0f)
 ## 相关文档
 
 - [Vector3 类总览](vector3.md) - 返回类总览
-- [`operator+`](operator_add.md) - 加法运算
-- [`operator-=`](operator_sub_assign.md) - 减法赋值
+- [`operator+`](operator-add.md) - 加法运算
+- [`operator-=`](operator-sub-assign.md) - 减法赋值