Refactor models and routes for item management

Reorganized model structure by replacing 'object' and 'items' with a unified 'item' model using UUIDs, and moved base model logic into separate files. Updated routes to use the new item model and improved request/response handling. Enhanced user and setting models, added utility functions, and improved error handling throughout the codebase. Also added initial .idea project files and minor admin API improvements.

Co-Authored-By: 砂糖橘 <54745033+Foxerine@users.noreply.github.com>

model/item.py

@@ -0,0 +1,77 @@
+from datetime import datetime
+from enum import StrEnum
+from typing import TYPE_CHECKING, Self, Optional
+from uuid import UUID
+
+from sqlmodel import Field, Relationship
+
+from .base import SQLModelBase, UUIDTableBase
+
+if TYPE_CHECKING:
+    from .user import User
+
+class ItemTypeEnum(StrEnum):
+    normal = 'normal'
+    car = 'car'
+
+class ItemStatusEnum(StrEnum):
+    ok = 'ok'
+    lost = 'lost'
+
+class ItemBase(SQLModelBase):
+    type: ItemTypeEnum = ItemTypeEnum.normal
+    """物品的类型"""
+
+    name: str
+    """物品名称"""
+
+    icon: str | None = None
+    """物品图标"""
+
+    status: ItemStatusEnum = ItemStatusEnum.ok
+    """物品状态"""
+
+    phone: str | None = None
+    """联系电话"""
+
+    description: str | None = None
+    """物品描述"""
+
+class Item(ItemBase, UUIDTableBase, table=True):
+    expires_at: datetime | None = None
+    """物品过期时间"""
+
+    lost_at: datetime | None = None
+    """物品丢失的时间"""
+
+    find_ip: str | None = None
+    """最后一次发现的IP地址"""
+
+    user_id: UUID = Field(foreign_key='user.id', ondelete='CASCADE')
+    """所属用户ID"""
+
+    user: 'User' = Relationship(back_populates='items')
+
+    parent_item_id: UUID | None = Field(foreign_key='item.id', ondelete='RESTRICT')
+    parent_item: Optional['Item'] = Relationship(back_populates='sub_items', sa_relationship_kwargs={'remote_side': 'Item.id'})
+    sub_items: list['Item'] = Relationship(back_populates='parent_item', passive_deletes='all')
+
+class ItemDataUpdateRequest(ItemBase):
+    pass
+
+class ItemDataResponse(ItemBase):
+    expires_at: datetime | None = None
+    """物品过期时间"""
+
+    lost_at: datetime | None = None
+    """物品丢失的时间"""
+
+class ItemDataResponseAdmin(ItemBase):
+    expires_at: datetime | None = None
+    """物品过期时间"""
+
+    lost_at: datetime | None = None
+    """物品丢失的时间"""
+
+    user_id: UUID = Field(foreign_key='user.id')
+    """所属用户ID"""