docs: fix resources module documentation discrepancies

- Add missing MakeResourceGUID helper function to resourcetypes.md
- Add note about GetResourceType<T>() template specializations
- Merge duplicate '缓存控制' section into '内存管理' in resourcecache.md
- Verify all methods documented match source code implementations

Fixed documentation to match:
- ResourceTypes.h: MakeResourceGUID function now documented
- ResourceCache.h: OnZeroRefCount and Clear methods now properly listed
- AsyncLoader.md: Removed duplicate progress query section

docs/api/resources/resourcecache/resourcecache.md

@@ -58,11 +58,6 @@
 | `size_t GetMemoryBudget() const` | 获取内存预算 |
 | `void OnMemoryPressure(size_t requiredBytes)` | 内存压力回调，驱逐资源以释放空间 |
 | `void OnZeroRefCount(ResourceGUID guid)` | 当引用计数为零时的回调 |
-
-### 缓存控制
-
-| 方法 | 描述 |
-|------|------|
 | `void Flush()` | 清空缓存，释放所有资源 |
 | `void Clear()` | 清空缓存但不释放资源 |