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_item.py

@@ -0,0 +1,55 @@
+"""
+KPI 項目 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.kpi_template import KPITemplate
+
+
+class KPIItem(Base):
+    """KPI 項目"""
+
+    __tablename__ = "KPI_D_items"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    sheet_id: Mapped[int] = mapped_column(ForeignKey("KPI_D_sheets.id", ondelete="CASCADE"), nullable=False)
+    template_id: Mapped[Optional[int]] = mapped_column(ForeignKey("KPI_D_templates.id"))
+    sort_order: Mapped[int] = mapped_column(Integer, default=0)
+
+    # 項目資訊
+    name: Mapped[str] = mapped_column(String(200), nullable=False)
+    category: Mapped[str] = mapped_column(String(50), nullable=False)  # financial, customer, internal, learning
+    weight: Mapped[int] = mapped_column(Integer, nullable=False)  # 權重百分比 (1-100)
+
+    # 等級標準
+    level0_criteria: Mapped[Optional[str]] = mapped_column(Text)
+    level1_criteria: Mapped[Optional[str]] = mapped_column(Text)
+    level2_criteria: Mapped[Optional[str]] = mapped_column(Text)
+    level3_criteria: Mapped[Optional[str]] = mapped_column(Text)
+    level4_criteria: Mapped[Optional[str]] = mapped_column(Text)
+
+    # 自評
+    self_eval_level: Mapped[Optional[int]] = mapped_column(Integer)  # 0-4
+    self_eval_note: Mapped[Optional[str]] = mapped_column(Text)
+
+    # 主管評核
+    final_level: Mapped[Optional[int]] = mapped_column(Integer)  # 0-4
+    final_note: Mapped[Optional[str]] = mapped_column(Text)
+
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    # Relationships
+    sheet: Mapped["KPISheet"] = relationship("KPISheet", back_populates="items")
+    template: Mapped[Optional["KPITemplate"]] = relationship("KPITemplate", back_populates="kpi_items")
+
+    def __repr__(self) -> str:
+        return f"<KPIItem id={self.id} name={self.name} weight={self.weight}>"