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/core/filewriter/Write.md

@@ -0,0 +1,48 @@
+# FileWriter::Write
+
+```cpp
+bool Write(const char* data, size_t length);
+bool Write(const Containers::String& str);
+```
+
+写入数据到文件。
+
+**描述**
+
+将数据写入文件。如果文件未打开，操作会失败。
+
+**参数：**
+- `data` - 要写入的字符数据
+- `length` - 要写入的字节数
+- `str` - 要写入的 String 对象
+
+**返回：** `bool` - 是否写入成功
+
+**复杂度：** O(n) 其中 n 为写入的字节数
+
+**示例：**
+
+```cpp
+#include <XCEngine/Core/FileWriter.h>
+#include <XCEngine/Containers/String.h>
+
+using namespace XCEngine::Core;
+
+FileWriter writer("output.txt");
+if (writer.IsOpen()) {
+    // 写入原始字符数组
+    writer.Write("Hello, World!", 13);
+    writer.Write("\n", 1);
+    
+    // 写入 String
+    Containers::String message = "This is a test string";
+    writer.Write(message);
+    
+    writer.Flush();
+}
+```
+
+## 相关文档
+
+- [FileWriter 总览](filewriter.md) - 返回类总览
+- [Flush](Flush.md) - 刷新缓冲区