refactor: 重构 Agent 模块为 AgentScope，删除旧版 CrewAI/LiteLLM 实现

backend/src/models/schedule_subscriptions.py

@@ -12,6 +12,7 @@ from core.db.base import Base, TimestampMixin
 
 class SubscriptionStatus(str, Enum):
     ACTIVE = "active"
+    PENDING = "pending"
     PAUSED = "paused"
     UNSUBSCRIBED = "unsubscribed"
 
@@ -22,6 +23,13 @@ class NotifyLevel(str, Enum):
     NONE = "none"
 
 
+class SubscriptionPermission(int, Enum):
+    VIEW = 1  # 001 - 可查看
+    INVITE = 2  # 010 - 可邀请
+    EDIT = 4  # 100 - 可编辑
+    OWNER = 7  # 111 - 所有者（VIEW + INVITE + EDIT）
+
+
 class ScheduleSubscription(TimestampMixin, Base):
     __tablename__: str = "schedule_subscriptions"
     __table_args__ = {"extend_existing": True}