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/containers/hashmap/constructor.md

@@ -0,0 +1,31 @@
+# HashMap::HashMap
+
+```cpp
+HashMap();
+explicit HashMap(size_t bucketCount, Memory::IAllocator* allocator = nullptr);
+```
+
+构造哈希表实例。
+
+**参数：**
+- `bucketCount` - 初始桶的数量，默认为 16。若传入 0，则自动调整为 16。
+- `allocator` - 内存分配器指针，默认为 `nullptr`（使用默认分配器）。
+
+**返回：** 无
+
+**复杂度：** O(bucketCount)，需要初始化所有桶
+
+**示例：**
+
+```cpp
+XCEngine::Containers::HashMap<int, const char*> map1;
+
+XCEngine::Containers::HashMap<int, const char*> map2(32);
+
+auto customAllocator = XCEngine::Memory::GetDefaultAllocator();
+XCEngine::Containers::HashMap<int, const char*> map3(64, customAllocator);
+```
+
+## 相关文档
+
+- [HashMap 总览](hashmap.md) - 返回类总览