fix: improve doc link navigation and tree display

- Fix link resolution with proper relative/absolute path handling
- Improve link styling with underline decoration
- Hide leaf nodes from tree, only show directories
- Fix log file path for packaged app

docs/api/resources/resourcemanager/setmemorybudget.md

@@ -0,0 +1,24 @@
+# ResourceManager::SetMemoryBudget
+
+```cpp
+void SetMemoryBudget(size_t bytes)
+```
+
+设置资源管理的内存预算上限。当缓存中资源的总内存占用超过预算时，会触发 LRU 驱逐策略释放内存。
+
+**参数：**
+- `bytes` - 内存预算大小（字节）
+
+**返回：** 无
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+ResourceManager::Get().SetMemoryBudget(1024 * 1024 * 1024);  // 1GB 预算
+```
+
+## 相关文档
+
+- [ResourceManager 总览](resourcemanager.md) - 返回类总览