feat: 波士顿产品矩阵 — 四象限分析(明星/现金牛/问题/瘦狗)

- 数据层: product_sales表+导入脚本(93条, 酣客1-8月商品销售排行榜)
- 后端: GET /api/cma/products/matrix?entity_id&months
  横轴=销售趋势(线性回归), 纵轴=加权毛利率, 气泡=销售额
- 前端: ProductMatrix.vue ECharts散点图+象限卡片+明细表, 支持酣客/博海切换
- 验证: API四象限分类正确, 数据联动, 前端路由200, 全部通过

backend/app/models/__init__.py

@@ -6,6 +6,7 @@ from app.models.budget_plan import BudgetPlan
 from app.models.cost_model import StandardCost, ActualCost, AbcActivity, AbcAllocation
 from app.models.knowledge import KnowledgeEvent, KnowledgeSummary
 from app.models.driver_budget import DriverFactorTemplate, DriverFactorBudget
+from app.models.product_sales import ProductSales
 
 
 class Entity(Base):

backend/app/models/product_sales.py

@@ -0,0 +1,24 @@
+"""商品销售数据模型 — 波士顿产品矩阵
+从《商品销售排行榜》Excel导入，支撑四象限分析
+"""
+from sqlalchemy import Column, Integer, String, Float, DateTime, func
+from app.database import Base
+
+
+class ProductSales(Base):
+    """商品销售月度数据"""
+    __tablename__ = "product_sales"
+
+    id = Column(Integer, primary_key=True, index=True)
+    entity_id = Column(Integer, default=1, comment="企业ID: 1=酣客 2=博海")
+    product_code = Column(String(50), nullable=False, comment="商品编码")
+    product_name = Column(String(100), nullable=False, comment="商品名称")
+    period_month = Column(String(10), nullable=False, comment="期间 YYYY-MM")
+    sales_amount = Column(Float, default=0, comment="销售金额")
+    cost_amount = Column(Float, default=0, comment="成本金额")
+    gross_profit = Column(Float, default=0, comment="毛利")
+    gross_margin_rate = Column(Float, default=0, comment="毛利率(%)")
+    sales_qty = Column(Integer, default=0, comment="销售数量")
+    unit = Column(String(30), default="", comment="单位")
+    created_at = Column(DateTime, server_default=func.now())
+    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())