feat：优化对多模态/非多模态replyer的配置

pytests/A_memorix_test/test_legacy_config_migration.py

@@ -33,3 +33,34 @@ def test_legacy_learning_list_with_numeric_fourth_column_is_migrated():
             "enable_jargon_learning": False,
         },
     ]
+
+
+def test_visual_multimodal_replyer_is_migrated_to_replyer_mode() -> None:
+    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() -> None:
+    payload = {
+        "chat": {
+            "replyer_generator_type": "legacy",
+        },
+        "visual": {},
+    }
+
+    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"]