feat: add Leave Pydantic schemas

Co-Authored-By: Claude <noreply@anthropic.com>

backend/app/schemas/leave.py

@@ -0,0 +1,55 @@
+from datetime import date, datetime
+from uuid import UUID
+from pydantic import BaseModel, Field
+
+
+LEAVE_TYPES = ["年假", "事假", "病假", "调休", "其他"]
+
+
+class LeaveCreate(BaseModel):
+    manager_id: UUID
+    leave_type: str = Field(default="事假", pattern="^(年假|事假|病假|调休|其他)$")
+    start_date: date
+    end_date: date
+    reason: str = ""
+
+
+class LeaveUpdate(BaseModel):
+    manager_id: UUID | None = None
+    leave_type: str | None = Field(default=None, pattern="^(年假|事假|病假|调休|其他)$")
+    start_date: date | None = None
+    end_date: date | None = None
+    reason: str | None = None
+
+
+class LeaveOut(BaseModel):
+    id: UUID
+    manager_id: UUID
+    manager_name: str = ""
+    leave_type: str
+    start_date: date
+    end_date: date
+    days: int = 0
+    reason: str = ""
+    submitted_by: UUID
+    submitted_by_name: str = ""
+    created_at: datetime | None = None
+    updated_at: datetime | None = None
+
+    model_config = {"from_attributes": True}
+
+
+class LeaveOverviewItem(BaseModel):
+    manager_id: UUID
+    manager_name: str
+    leave_type: str
+    start_date: date
+    end_date: date
+    days: int
+
+
+class LeaveOverview(BaseModel):
+    week_start: str
+    week_end: str
+    total_on_leave: int
+    leave_list: list[LeaveOverviewItem]