Update app.py

app.py

@@ -52,7 +52,7 @@ def main_ui():
 Generate program files for a project as a single plain text string, strictly adhering to the markdown format below. **Every single line**, including backticks, language identifiers, file content, and empty lines, **must** be prefixed with '# ' to comment it out. This is critical to avoid code box interference. The output must include a complete file structure and the contents of each file, with all necessary code and configurations for a functional project. **Do not deviate from this format under any circumstances.**
 
 # Format (exact return format with single leading "# "):
-```markdown
+```plaintext
 # # Space: [owner/project-name]
 # ## File Structure
 # ```