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/find.md

@@ -0,0 +1,39 @@
+# HashMap::Find
+
+```cpp
+Value* Find(const Key& key);
+const Value* Find(const Key& key) const;
+```
+
+根据键查找对应的值指针。
+
+**参数：**
+- `key` - 要查找的键
+
+**返回：** 如果找到，返回指向值的指针；否则返回 `nullptr`。
+
+**复杂度：** O(1) 平均，最坏 O(n)（同一桶中有多个键发生哈希冲突）
+
+**示例：**
+
+```cpp
+XCEngine::Containers::HashMap<int, const char*> map;
+map.Insert(1, "one");
+map.Insert(2, "two");
+
+const char* value1 = map.Find(1);
+if (value1) {
+    std::cout << "Found: " << value1 << std::endl; // 输出 "Found: one"
+}
+
+const char* value2 = map.Find(99);
+if (!value2) {
+    std::cout << "Not found" << std::endl; // 输出 "Not found"
+}
+```
+
+## 相关文档
+
+- [HashMap 总览](hashmap.md) - 返回类总览
+- [Contains](contains.md) - 检查是否包含键
+- [operator[]](./operator-subscript.md) - 下标访问