feat: support session_id in current chat search

README.md

@@ -486,7 +486,7 @@ curl -X POST http://127.0.0.1:8010/memories/search \
   -d '{
     "user_id": "u_123",
     "user_key": "uk_xxx",
-    "conversation_id": "c_456",
+    "session_id": "chat:c_456",
     "query": "图片里的蓝色圆形在哪里？",
     "scope": ["current_chat", "resources"],
     "method": "hybrid",
@@ -502,7 +502,7 @@ curl -X POST http://127.0.0.1:8010/memories/search \
 
 | scope | 行为 |
 |---|---|
-| `current_chat` | 搜索 `chat:{conversation_id}`，需要传 `conversation_id` |
+| `current_chat` | 搜索指定聊天 session，推荐传完整 `session_id`，如 `chat:c_456`；也兼容旧字段 `conversation_id`，会转换为 `chat:{conversation_id}` |
 | `resources` | 搜索当前用户已提取且未删除的资源 session |
 | `all_user_memory` | 搜索用户全部记忆，不加 session 过滤 |