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/kpi_review_log.py

@@ -0,0 +1,36 @@
+"""
+KPI 審核紀錄 Model
+"""
+from datetime import datetime
+from typing import Optional, TYPE_CHECKING
+
+from sqlalchemy import String, Integer, DateTime, Text, ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+
+if TYPE_CHECKING:
+    from app.models.kpi_sheet import KPISheet
+    from app.models.employee import Employee
+
+
+class KPIReviewLog(Base):
+    """KPI 審核紀錄"""
+
+    __tablename__ = "KPI_D_review_logs"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    sheet_id: Mapped[int] = mapped_column(ForeignKey("KPI_D_sheets.id", ondelete="CASCADE"), nullable=False)
+    action: Mapped[str] = mapped_column(String(50), nullable=False)  # submit, approve, reject, self_eval, manager_eval
+    actor_id: Mapped[int] = mapped_column(ForeignKey("KPI_D_employees.id"), nullable=False)
+    from_status: Mapped[Optional[str]] = mapped_column(String(20))
+    to_status: Mapped[Optional[str]] = mapped_column(String(20))
+    comment: Mapped[Optional[str]] = mapped_column(Text)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+
+    # Relationships
+    sheet: Mapped["KPISheet"] = relationship("KPISheet", back_populates="review_logs")
+    actor: Mapped["Employee"] = relationship("Employee")
+
+    def __repr__(self) -> str:
+        return f"<KPIReviewLog id={self.id} action={self.action} sheet={self.sheet_id}>"