refactor: 清理不需要的代码文件，添加.gitignore，优化项目结构

src/core/models.py

@@ -102,3 +102,16 @@ class Alert(Base):
     is_active = Column(Boolean, default=True)
     created_at = Column(DateTime, default=datetime.now)
     resolved_at = Column(DateTime)
+
+class WorkOrderSuggestion(Base):
+    """工单AI建议与人工描述表"""
+    __tablename__ = "work_order_suggestions"
+    
+    id = Column(Integer, primary_key=True)
+    work_order_id = Column(Integer, ForeignKey("work_orders.id"), nullable=False)
+    ai_suggestion = Column(Text)
+    human_resolution = Column(Text)
+    ai_similarity = Column(Float)
+    approved = Column(Boolean, default=False)
+    created_at = Column(DateTime, default=datetime.now)
+    updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now)