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/quaternion/normalized.md

@@ -1,12 +1,34 @@
-# Quaternion::Normalized
+# Quaternion::Normalized / Normalize
+
+## 实例方法
 
 ```cpp
 Quaternion Normalized() const
-Quaternion Normalize(const Quaternion& q)
+```
+
+返回当前四元数的归一化副本（不修改原四元数）。
+
+**返回：** `Quaternion` - 归一化后的四元数副本
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Quaternion unit = quat.Normalized();  // quat 保持不变
+```
+
+## 静态方法
+
+```cpp
+static Quaternion Normalize(const Quaternion& q)
 ```
 
 归一化四元数。
 
+**参数：**
+- `q` - 要归一化的四元数
+
 **返回：** `Quaternion` - 归一化后的四元数
 
 **复杂度：** O(1)
@@ -14,6 +36,5 @@ Quaternion Normalize(const Quaternion& q)
 **示例：**
 
 ```cpp
-Quaternion unit = quat.Normalized();
-Quaternion unit2 = Quaternion::Normalize(quat);
+Quaternion unit = Quaternion::Normalize(quat);
 ```