docs: Document stub/not-implemented methods in resources module

Fixed discrepancies between source code and documentation:
- AsyncLoader: Document Initialize() ignores workerThreadCount, Submit() doesn't do actual async loading, Update() is stub
- ResourceManager: Document UnloadUnused() and ReloadResource() are stubs
- ResourceCache: Document OnZeroRefCount() and Flush() are stubs
- ResourceDependencyGraph: Document TopologicalSort() returns empty (stub)
- ResourceFileSystem: Document GetResourceInfo() doesn't fill modifiedTime, EnumerateResources() is stub
- FileArchive: Document Enumerate() is stub
- ResourcePackageBuilder: Document AddDirectory() is stub
- ImportSettings: Document LoadFromJSON/SaveToJSON are stubs
- TextureImportSettings/MeshImportSettings: Document JSON methods are stubs
- TextureLoader/MeshLoader/MaterialLoader/ShaderLoader/AudioLoader: Document GetDefaultSettings() returns nullptr
- AudioLoader: Document ParseWAVData() is stub, Load() doesn't parse WAV headers
- ShaderLoader: Document DetectShaderType/ParseShaderSource are stubs
- MaterialLoader: Document ParseMaterialData() is stub
- Texture: Document Create() mipLevels=0 behavior, GenerateMipmaps() returns false
- Mesh: Document MeshLoader::Load() is example only
- IResourceLoader: Document GetDefaultSettings() returns nullptr for all loaders

docs/api/math/aabb/aabb.md

@@ -31,12 +31,12 @@ struct OBB {
 
 | 方法 | 返回值 | 描述 |
 |------|--------|------|
-| [GetAxis(index)](obb-getaxis.md) | `Vector3` | 获取局部轴 |
-| [GetMin()](obb-getmin.md) | `Vector3` | 局部空间最小点 |
-| [GetMax()](obb-getmax.md) | `Vector3` | 局部空间最大点 |
-| [Contains(point)](obb-contains.md) | `bool` | 点是否在 OBB 内 |
-| [Intersects(OBB)](obb-intersects-obb.md) | `bool` | 与另一个 OBB 相交 |
-| [Intersects(Sphere)](obb-intersects-sphere.md) | `bool` | 与球体相交 |
+| [GetAxis(index)](getaxis.md) | `Vector3` | 获取局部轴（index 必须是 0、1 或 2） |
+| [GetMin()](../box/getmin.md) | `Vector3` | 局部空间最小点 |
+| [GetMax()](../box/getmax.md) | `Vector3` | 局部空间最大点 |
+| [Contains(point)](../box/contains.md) | `bool` | 点是否在 OBB 内 |
+| [Intersects(OBB)](intersects-obb.md) | `bool` | 与另一个 OBB 相交 |
+| [Intersects(Sphere)](intersects-sphere.md) | `bool` | 与球体相交 |
 
 ## 相关文档
 

docs/api/math/aabb/getaxis.md

@@ -0,0 +1,23 @@
+# OBB::GetAxis
+
+```cpp
+Vector3 GetAxis(int index) const
+```
+
+获取 OBB 的局部坐标轴。
+
+**参数：**
+- `index` - 轴索引（0=X轴, 1=Y轴, 2=Z轴）
+
+**返回：** `Vector3` - 对应轴的方向向量
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+OBB obb = ...;
+Vector3 xAxis = obb.GetAxis(0);  // 局部 X 轴
+Vector3 yAxis = obb.GetAxis(1);  // 局部 Y 轴
+Vector3 zAxis = obb.GetAxis(2);  // 局部 Z 轴
+```

docs/api/math/aabb/intersects-obb.md

@@ -0,0 +1,24 @@
+# OBB::Intersects (OBB)
+
+```cpp
+bool Intersects(const OBB& other) const
+```
+
+检测两个 OBB 是否相交（使用 SAT 分离轴定理）。
+
+**参数：**
+- `other` - 另一个 OBB
+
+**返回：** `bool` - true 表示相交
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+OBB obbA = ...;
+OBB obbB = ...;
+if (obbA.Intersects(obbB)) {
+    // 两个有向包围盒相交
+}
+```

docs/api/math/aabb/intersects-sphere.md

@@ -0,0 +1,24 @@
+# OBB::Intersects (Sphere)
+
+```cpp
+bool Intersects(const Sphere& sphere) const
+```
+
+检测 OBB 是否与球体相交。
+
+**参数：**
+- `sphere` - 要检测的球体
+
+**返回：** `bool` - true 表示相交
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+OBB obb = ...;
+Sphere sphere = ...;
+if (obb.Intersects(sphere)) {
+    // OBB 与球体相交
+}
+```