Fix: AttributeError in OCRProcessor and refactor all relative imports to absolute

app/ui/file_operations.py

@@ -7,8 +7,8 @@ import json
 import tkinter as tk
 from tkinter import messagebox, filedialog, scrolledtext
 
-from .logging_ui import add_to_log
-from .ui_widgets import center_window
+from app.ui.logging_ui import add_to_log
+from app.ui.ui_widgets import center_window
 from app.config.settings import ConfigManager
 
 
@@ -59,7 +59,7 @@ def ensure_directories():
 
 def clean_cache(log_widget):
     """清除处理缓存"""
-    from .command_runner import set_running_task
+    from app.ui.command_runner import set_running_task
     try:
         config = ConfigManager()
         processed_record = config.get_path('Paths', 'processed_record', fallback='data/processed_files.json')