Revert "fix: hide docs in leaf directories from tree display"

This reverts commit d95e6c11ec.

src/components/ApiDocViewer.tsx

@@ -71,25 +71,13 @@ export const ApiDocViewer = ({ onDocsPathChange, showAddModal, onCloseAddModal }
       
       setExternalDocs(docs)
       
-      const dirs = new Set(docs.map(d => {
-        const parts = d.relativePath.split('/')
-        return parts.length >= 2 ? parts.slice(0, -1).join('/') : ''
-      }))
-
-      const dirsWithSubdirs = new Set(
-        docs
-          .filter(d => d.relativePath.split('/').length >= 3)
-          .map(d => d.relativePath.split('/').slice(0, -1).join('/'))
-      )
-
-      const leafDirs = new Set([...dirs].filter(d => !dirsWithSubdirs.has(d)))
-
       const fileList = docs
         .filter(doc => {
           const parts = doc.relativePath.split('/')
           if (parts.length < 2) return true
-          const parentDir = parts.slice(0, -1).join('/')
-          return !leafDirs.has(parentDir)
+          const filename = parts[parts.length - 1].replace(/\.md$/, '')
+          const parentFolder = parts[parts.length - 2]
+          return filename !== parentFolder
         })
         .map(d => d.relativePath)
       const tree = buildFileTree(fileList, '/')