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/dashboard_alert.py

@@ -0,0 +1,41 @@
+"""
+儀表板警示 Model
+"""
+from datetime import datetime
+from typing import Optional, TYPE_CHECKING
+
+from sqlalchemy import String, Integer, Boolean, DateTime, Text, ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+
+if TYPE_CHECKING:
+    from app.models.employee import Employee
+    from app.models.kpi_sheet import KPISheet
+
+
+class DashboardAlert(Base):
+    """儀表板警示"""
+
+    __tablename__ = "KPI_D_alerts"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    alert_type: Mapped[str] = mapped_column(String(50), nullable=False)
+    # deadline_approaching, overdue, weight_invalid
+    severity: Mapped[str] = mapped_column(String(20), default="warning")  # info, warning, error
+    title: Mapped[str] = mapped_column(String(200), nullable=False)
+    description: Mapped[Optional[str]] = mapped_column(Text)
+    related_sheet_id: Mapped[Optional[int]] = mapped_column(ForeignKey("KPI_D_sheets.id", ondelete="CASCADE"))
+    related_employee_id: Mapped[Optional[int]] = mapped_column(ForeignKey("KPI_D_employees.id"))
+    is_resolved: Mapped[bool] = mapped_column(Boolean, default=False)
+    resolved_at: Mapped[Optional[datetime]] = mapped_column(DateTime)
+    resolved_by: Mapped[Optional[int]] = mapped_column(ForeignKey("KPI_D_employees.id"))
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+
+    # Relationships
+    related_sheet: Mapped[Optional["KPISheet"]] = relationship("KPISheet")
+    related_employee: Mapped[Optional["Employee"]] = relationship("Employee", foreign_keys=[related_employee_id])
+    resolver: Mapped[Optional["Employee"]] = relationship("Employee", foreign_keys=[resolved_by])
+
+    def __repr__(self) -> str:
+        return f"<DashboardAlert id={self.id} type={self.alert_type} severity={self.severity}>"