fix:恢复旧配置迁移逻辑

恢复 planner/replyer 旧字段到新 schema 的迁移逻辑。
补充回归测试，确保旧版 bot 配置仍可正常加载。

pytests/A_memorix_test/test_legacy_config_migration.py

@@ -33,3 +33,47 @@ def test_legacy_learning_list_with_numeric_fourth_column_is_migrated():
             "enable_jargon_learning": False,
         },
     ]
+
+
+def test_visual_multimodal_planner_is_migrated_to_planner_mode():
+    payload = {"visual": {"multimodal_planner": True}}
+
+    result = try_migrate_legacy_bot_config_dict(payload)
+
+    assert result.migrated is True
+    assert "visual.multimodal_planner_moved_to_visual.planner_mode" in result.reason
+    assert result.data["visual"]["planner_mode"] == "multimodal"
+    assert "multimodal_planner" not in result.data["visual"]
+
+
+def test_chat_multimodal_planner_is_migrated_to_visual_planner_mode():
+    payload = {"chat": {"multimodal_planner": True}}
+
+    result = try_migrate_legacy_bot_config_dict(payload)
+
+    assert result.migrated is True
+    assert "chat.multimodal_planner_moved_to_visual.planner_mode" in result.reason
+    assert result.data["visual"]["planner_mode"] == "multimodal"
+    assert "multimodal_planner" not in result.data["chat"]
+
+
+def test_visual_multimodal_replyer_is_migrated_to_replyer_mode():
+    payload = {"visual": {"multimodal_replyer": True}}
+
+    result = try_migrate_legacy_bot_config_dict(payload)
+
+    assert result.migrated is True
+    assert "visual.multimodal_replyer_moved_to_visual.replyer_mode" in result.reason
+    assert result.data["visual"]["replyer_mode"] == "multimodal"
+    assert "multimodal_replyer" not in result.data["visual"]
+
+
+def test_chat_replyer_generator_type_is_migrated_to_replyer_mode():
+    payload = {"chat": {"replyer_generator_type": "legacy"}}
+
+    result = try_migrate_legacy_bot_config_dict(payload)
+
+    assert result.migrated is True
+    assert "chat.replyer_generator_type_moved_to_visual.replyer_mode" in result.reason
+    assert result.data["visual"]["replyer_mode"] == "text"
+    assert "replyer_generator_type" not in result.data["chat"]