Fix AI processor cache initialization issue and create empty cache file

ai_processor/cache_manager.py

@@ -25,10 +25,24 @@ class CacheManager:
             if os.path.exists(self.cache_file):
                 with open(self.cache_file, 'r', encoding='utf-8') as f:
                     return json.load(f)
-            return {}
+            else:
+                # Create empty cache file if it doesn't exist
+                cache_data = {
+                    "cache_version": "1.0",
+                    "created": datetime.now().isoformat(),
+                    "processed_files": {}
+                }
+                self.cache = cache_data
+                self._save_cache()
+                return cache_data
         except Exception as e:
             logger.error(f"Error loading cache file {self.cache_file}: {e}")
-            return {}
+            # Return empty cache on error
+            return {
+                "cache_version": "1.0",
+                "created": datetime.now().isoformat(),
+                "processed_files": {}
+            }
     
     def _save_cache(self) -> None:
         """Save cache to file."""

ai_processor/processed_articles_cache.json

@@ -0,0 +1,5 @@
+{
+  "cache_version": "1.0",
+  "created": "2026-02-02T15:43:08.000Z",
+  "processed_files": {}
+}