fix: Remove duplicate Path import in translation phase

- Remove redundant 'from pathlib import Path' inside translation function
- Path is already imported at module level, causing scope conflict
- Fixes "cannot access local variable 'Path' where it is not associated with a value" error

Author: lufftw

tools/ai-markmap-agent/src/graph.py

@@ -942,7 +942,6 @@ def run_translations(state: WorkflowState) -> WorkflowState:
                     # Import unified translation function from translate_only.py
                     import sys
                     import importlib.util
-                    from pathlib import Path
 
                     # Get path to translate_only.py
                     translate_only_path = Path(__file__).parent.parent.parent / "translate_only.py"