refactor(schemas): 统一 message/notification 命名边界，旧名收敛至兼容映射表

- notification 域：渠道能力（MessageChannel→NotificationChannel、ChannelCapability* 迁入 notification.py）
- message 域：消息收发（Notification→Message、NotificationType→MessageType、CommingMessage→IncomingMessage、NotificationHistoryItem→MessageHistoryItem、NotificationClear*→MessageClear*）
- Agent 工具契约：send_notification_message→send_message、notification_callback→message_callback
- 源码不保留旧名物理别名，旧导入经 app/runtime/compat/manifest.py SYMBOL_ALIASES 惰性解析
- API 路径与持久化键冻结不变，前端零改动
- 新增兼容守护测试与 docs/rules/07 命名边界规范

app/command.py

@@ -17,8 +17,8 @@ from app.application.messaging.skill import SkillInteractionHandler
 from app.runtime.thread import ThreadHelper
 from app.runtime.log import logger
 from app.scheduler import Scheduler
-from app.schemas import Notification, CommandRegisterEventData
-from app.schemas.types import EventType, MessageChannel, ChainEventType
+from app.schemas import Message, CommandRegisterEventData
+from app.schemas.types import EventType, NotificationChannel, ChainEventType
 from app.foundation.reflection import ObjectUtils
 from app.foundation.singleton import Singleton
 from app.foundation.collections import DictUtils
@@ -292,7 +292,7 @@ class Command(metaclass=Singleton):
         self,
         command: Dict[str, any],
         data_str: Optional[str] = "",
-        channel: MessageChannel = None,
+        channel: NotificationChannel = None,
         source: Optional[str] = None,
         userid: Union[str, int] = None,
     ):
@@ -303,7 +303,7 @@ class Command(metaclass=Singleton):
             # 定时服务
             if userid:
                 CommandChain().post_message(
-                    Notification(
+                    Message(
                         channel=channel,
                         source=source,
                         title=f"开始执行 {command.get('description')} ...",
@@ -316,7 +316,7 @@ class Command(metaclass=Singleton):
 
             if userid:
                 CommandChain().post_message(
-                    Notification(
+                    Message(
                         channel=channel,
                         source=source,
                         title=f"{command.get('description')} 执行完成",
@@ -393,7 +393,7 @@ class Command(metaclass=Singleton):
         self,
         cmd: str,
         data_str: Optional[str] = "",
-        channel: MessageChannel = None,
+        channel: NotificationChannel = None,
         source: Optional[str] = None,
         userid: Union[str, int] = None,
     ) -> None: