feat: Add Advoware History and Watcher services for document synchronization

- Implement AdvowareHistoryService for fetching and creating history entries.
- Implement AdvowareWatcherService for file operations including listing, downloading, and uploading with Blake3 hash verification.
- Introduce Blake3 utility functions for hash computation and verification.
- Create document sync cron step to poll Redis for pending Aktennummern and emit sync events.
- Develop document sync event handler to manage 3-way merge synchronization for Akten, including metadata updates and error handling.

services/redis_client.py

@@ -85,6 +85,7 @@ class RedisClientFactory:
         redis_host = os.getenv('REDIS_HOST', 'localhost')
         redis_port = int(os.getenv('REDIS_PORT', '6379'))
         redis_db = int(os.getenv('REDIS_DB_ADVOWARE_CACHE', '1'))
+        redis_password = os.getenv('REDIS_PASSWORD', None)  # Optional password
         redis_timeout = int(os.getenv('REDIS_TIMEOUT_SECONDS', '5'))
         redis_max_connections = int(os.getenv('REDIS_MAX_CONNECTIONS', '50'))
         
@@ -95,15 +96,22 @@ class RedisClientFactory:
         
         # Create connection pool
         if cls._connection_pool is None:
-            cls._connection_pool = redis.ConnectionPool(
-                host=redis_host,
-                port=redis_port,
-                db=redis_db,
-                socket_timeout=redis_timeout,
-                socket_connect_timeout=redis_timeout,
-                max_connections=redis_max_connections,
-                decode_responses=True  # Auto-decode bytes to strings
-            )
+            pool_kwargs = {
+                'host': redis_host,
+                'port': redis_port,
+                'db': redis_db,
+                'socket_timeout': redis_timeout,
+                'socket_connect_timeout': redis_timeout,
+                'max_connections': redis_max_connections,
+                'decode_responses': True  # Auto-decode bytes to strings
+            }
+            
+            # Add password if configured
+            if redis_password:
+                pool_kwargs['password'] = redis_password
+                logger.info("Redis authentication enabled")
+            
+            cls._connection_pool = redis.ConnectionPool(**pool_kwargs)
         
         # Create client from pool
         client = redis.Redis(connection_pool=cls._connection_pool)