新增溢出策略

src/memory_graph/manager_singleton.py

@@ -166,6 +166,7 @@ async def initialize_unified_memory_manager():
             # 短期记忆配置
             short_term_max_memories=getattr(config, "short_term_max_memories", 30),
             short_term_transfer_threshold=getattr(config, "short_term_transfer_threshold", 0.6),
+            short_term_overflow_strategy=getattr(config, "short_term_overflow_strategy", "transfer_all"),
             short_term_enable_force_cleanup=getattr(config, "short_term_enable_force_cleanup", True),
             short_term_cleanup_keep_ratio=getattr(config, "short_term_cleanup_keep_ratio", 0.9),
             # 长期记忆配置