Initial commit: KPI Management System Backend

Features:
- FastAPI backend with JWT authentication
- MySQL database with SQLAlchemy ORM
- KPI workflow: draft → pending → approved → evaluation → completed
- Ollama LLM API integration for AI features
- Gitea API integration for version control
- Complete API endpoints for KPI, dashboard, notifications

Tables: KPI_D_* prefix naming convention

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/models/employee.py

@@ -0,0 +1,68 @@
+"""
+員工 Model
+"""
+from datetime import datetime, date
+from typing import Optional, List, TYPE_CHECKING
+
+from sqlalchemy import String, Integer, Boolean, DateTime, Date, ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+
+if TYPE_CHECKING:
+    from app.models.department import Department
+    from app.models.kpi_sheet import KPISheet
+    from app.models.notification import Notification
+
+
+class Employee(Base):
+    """員工"""
+
+    __tablename__ = "KPI_D_employees"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    employee_no: Mapped[str] = mapped_column(String(20), unique=True, nullable=False)
+    name: Mapped[str] = mapped_column(String(100), nullable=False)
+    email: Mapped[str] = mapped_column(String(200), unique=True, nullable=False)
+    password_hash: Mapped[str] = mapped_column(String(200), nullable=False)
+    department_id: Mapped[int] = mapped_column(ForeignKey("KPI_D_departments.id"), nullable=False)
+    manager_id: Mapped[Optional[int]] = mapped_column(ForeignKey("KPI_D_employees.id"))
+    job_title: Mapped[Optional[str]] = mapped_column(String(100))
+    role: Mapped[str] = mapped_column(String(20), default="employee")  # employee, manager, admin, hr
+    status: Mapped[str] = mapped_column(String(20), default="active")  # active, inactive, resigned
+    hire_date: Mapped[Optional[date]] = mapped_column(Date)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    # Relationships
+    department: Mapped["Department"] = relationship("Department", back_populates="employees")
+    manager: Mapped[Optional["Employee"]] = relationship(
+        "Employee", remote_side=[id], back_populates="subordinates"
+    )
+    subordinates: Mapped[List["Employee"]] = relationship(
+        "Employee", back_populates="manager"
+    )
+    kpi_sheets: Mapped[List["KPISheet"]] = relationship(
+        "KPISheet", back_populates="employee", foreign_keys="KPISheet.employee_id"
+    )
+    notifications: Mapped[List["Notification"]] = relationship(
+        "Notification", back_populates="recipient"
+    )
+
+    @property
+    def is_manager(self) -> bool:
+        """是否為主管"""
+        return self.role in ("manager", "admin")
+
+    @property
+    def is_admin(self) -> bool:
+        """是否為管理員"""
+        return self.role == "admin"
+
+    @property
+    def is_hr(self) -> bool:
+        """是否為人資"""
+        return self.role == "hr"
+
+    def __repr__(self) -> str:
+        return f"<Employee {self.employee_no}: {self.name}>"