feat: add inbox messages module for calendar invitations

backend/src/v1/inbox_messages/schemas.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+from datetime import datetime
+from enum import Enum
+from typing import ClassVar
+from uuid import UUID
+
+from pydantic import BaseModel, ConfigDict
+
+
+class InboxMessageType(str, Enum):
+    FRIEND_REQUEST = "friend_request"
+    CALENDAR = "calendar"
+    SYSTEM = "system"
+    GROUP = "group"
+
+
+class InboxMessageStatus(str, Enum):
+    PENDING = "pending"
+    ACCEPTED = "accepted"
+    REJECTED = "rejected"
+    DISMISSED = "dismissed"
+
+
+class InboxMessageResponse(BaseModel):
+    model_config: ClassVar[ConfigDict] = ConfigDict(from_attributes=True)
+
+    id: UUID
+    recipient_id: UUID
+    sender_id: UUID | None = None
+    message_type: InboxMessageType
+    schedule_item_id: UUID | None = None
+    content: str | None = None
+    is_read: bool = False
+    status: InboxMessageStatus = InboxMessageStatus.PENDING
+    created_at: datetime
+
+
+class InboxMessageListRequest(BaseModel):
+    status: InboxMessageStatus | None = None
+
+
+class InboxMessageAcceptRequest(BaseModel):
+    permission_view: bool = True
+    permission_edit: bool = False
+    permission_invite: bool = False