refactor: make subscription lifecycle events durable

app/startup/context.py

@@ -8,6 +8,13 @@ from app.application.messaging.chat import (
     AsyncAgentChatRepository,
     AsyncUnitOfWork,
 )
+from app.application.outbox import AsyncOutboxTransaction
+from app.application.subscription.delete import SubscribeDeletionRepository
+from app.application.subscription.identity import SubscribeIdentityDeletionRepository
+from app.application.subscription.mutation import (
+    SubscriptionHistoryMutationRepository,
+    SubscriptionMutationRepository,
+)
 
 
 class AgentChatRepositoryFactory(Protocol):
@@ -26,6 +33,37 @@ class AsyncUnitOfWorkFactory(Protocol):
         ...
 
 
+class AsyncOutboxFactory(Protocol):
+    """由请求会话构造异步 outbox 事务端口的工厂。"""
+
+    def __call__(self, session: object) -> AsyncOutboxTransaction:
+        """绑定请求会话并返回 outbox 暂存与收口端口。"""
+        ...
+
+
+class SubscriptionRepositoryFactory(Protocol):
+    """由请求会话构造订阅写仓储的工厂。"""
+
+    def __call__(
+        self,
+        session: object,
+    ) -> (
+        SubscriptionMutationRepository
+        | SubscribeDeletionRepository
+        | SubscribeIdentityDeletionRepository
+    ):
+        """绑定请求会话并返回订阅领域仓储。"""
+        ...
+
+
+class SubscriptionHistoryRepositoryFactory(Protocol):
+    """由请求会话构造订阅历史写仓储的工厂。"""
+
+    def __call__(self, session: object) -> SubscriptionHistoryMutationRepository:
+        """绑定请求会话并返回订阅历史仓储。"""
+        ...
+
+
 class AsyncSessionProvider(Protocol):
     """FastAPI 请求级异步会话提供器。"""
 
@@ -70,9 +108,21 @@ class AgentChatRuntime:
     transaction: AsyncUnitOfWorkFactory
 
 
+@dataclass(frozen=True, slots=True)
+class SubscriptionRuntime:
+    """订阅 API 可见的请求级写事务运行时。"""
+
+    async_session: AsyncSessionProvider
+    repository: SubscriptionRepositoryFactory
+    history_repository: SubscriptionHistoryRepositoryFactory
+    transaction: AsyncUnitOfWorkFactory
+    outbox: AsyncOutboxFactory
+
+
 @dataclass(frozen=True, slots=True)
 class HostRuntime:
     """宿主组合根构建且在一个 FastAPI lifespan 内共享的运行时对象。"""
 
     agent_chat: AgentChatRuntime
+    subscription: SubscriptionRuntime
     compatibility_api_data: CompatibilityApiData