feat: implement recursive folder traversal for file indexing

The previous implementation only indexed files in the root directory,
ignoring files in subdirectories. This change adds recursive traversal
to index all files within the folder hierarchy while maintaining
relative paths for compatibility.

Minecraft.Client/FolderFile.cpp

@@ -1,4 +1,4 @@
-#include "stdafx.h"
+#include "stdafx.h"
 
 #include "../Minecraft.World/StringHelpers.h"
 #include "../Minecraft.World/compression.h"
@@ -7,7 +7,12 @@
 
 void FolderFile::_buildFileIndex()
 {
-    wstring searchPath = m_folderPath + L"\\*";
+    _buildFileIndexRecursive(m_folderPath, L"");
+}
+
+void FolderFile::_buildFileIndexRecursive(const wstring& currentPath, const wstring& relativePath)
+{
+    wstring searchPath = currentPath + L"\\*";
     WIN32_FIND_DATAW findData;
     HANDLE hFind = FindFirstFileW(searchPath.c_str(), &findData);
 
@@ -19,13 +24,20 @@ void FolderFile::_buildFileIndex()
 
     do
     {
-        if (!(findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
+        if (wcscmp(findData.cFileName, L".") == 0 || wcscmp(findData.cFileName, L"..") == 0)
+            continue;
+
+        wstring filename = findData.cFileName;
+        wstring fullRelativePath = relativePath.empty() ? filename : relativePath + L"\\" + filename;
+        wstring fullPath = currentPath + L"\\" + filename;
+
+        if (findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
         {
-            wstring filename = findData.cFileName;
-            wstring fullPath = m_folderPath + L"\\" + filename;
-            
-            // Store filename without path for compatibility with existing code
-            m_filePaths[filename] = fullPath;
+            _buildFileIndexRecursive(fullPath, fullRelativePath);
+        }
+        else
+        {
+            m_filePaths[fullRelativePath] = fullPath;
         }
     } while (FindNextFileW(hFind, &findData));