v0.2.0: CRM/ERP 系统升级 - 清理 .gitignore 并移除误提交的 venv/env/db 文件

- 更新 .gitignore：全面覆盖环境变量、数据库、日志、缓存、上传文件
- 移除误跟踪的 server/venv/、crm_data.db、.env 文件
- 新增 server/.env.example 模板
- 新增合同管理、利润核算、AI教练等功能模块
- 新增 Playwright e2e 测试套件
- 前后端多项功能升级和 bug 修复

server/app/models/erp.py

@@ -12,11 +12,13 @@ from sqlalchemy import (
     Boolean,
     DateTime,
     ForeignKey,
+    Index,
     Integer,
     Numeric,
     SmallInteger,
     String,
     Text,
+    UniqueConstraint,
     func,
 )
 from sqlalchemy.dialects.postgresql import UUID
@@ -56,8 +58,6 @@ class ProductSku(Base):
     name: Mapped[str] = mapped_column(String(200), nullable=False)
     spec: Mapped[str | None] = mapped_column(String(100), nullable=True)
     standard_price: Mapped[float] = mapped_column(Numeric(12, 2), default=0)
-    stock_qty: Mapped[float] = mapped_column(Numeric(12, 2), default=0)
-    warning_threshold: Mapped[float] = mapped_column(Numeric(12, 2), default=0)
     unit: Mapped[str] = mapped_column(String(20), default="桶")
     status: Mapped[int] = mapped_column(SmallInteger, default=1)
     created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now())
@@ -80,9 +80,18 @@ class InventoryFlow(Base):
     sku_id: Mapped[uuid.UUID] = mapped_column(
         UUID(as_uuid=True), ForeignKey("erp_product_skus.id"), nullable=False
     )
+    company_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("sys_companies.id"), nullable=False, index=True
+    )
     change_qty: Mapped[float] = mapped_column(Numeric(12, 2), nullable=False)
     reason: Mapped[str] = mapped_column(String(50), nullable=False)
     remark: Mapped[str | None] = mapped_column(Text, nullable=True)
+    purchase_unit_price: Mapped[float] = mapped_column(
+        Numeric(12, 2), default=0, comment="入库采购单价"
+    )
+    is_special_zero_cost: Mapped[bool] = mapped_column(
+        Boolean, default=False, comment="特殊零元入库标识，不参与 MWA 计算"
+    )
     operator_id: Mapped[uuid.UUID | None] = mapped_column(
         UUID(as_uuid=True), ForeignKey("sys_users.id"), nullable=True
     )
@@ -94,3 +103,34 @@ class InventoryFlow(Base):
 
     sku: Mapped[ProductSku | None] = relationship("ProductSku", lazy="selectin")
     operator: Mapped["SysUser | None"] = relationship("SysUser", lazy="selectin")  # noqa: F821
+
+
+class ErpSkuInventory(Base):
+    """SKU 分公司库存表 —— 同一 SKU 在不同公司有独立库存"""
+    __tablename__ = "erp_sku_inventory"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    sku_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("erp_product_skus.id"), nullable=False
+    )
+    company_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("sys_companies.id"), nullable=False, index=True
+    )
+    stock_qty: Mapped[float] = mapped_column(Numeric(12, 2), default=0)
+    warning_threshold: Mapped[float] = mapped_column(Numeric(12, 2), default=0)
+    mwa_unit_cost: Mapped[float] = mapped_column(
+        Numeric(12, 4), default=0,
+        comment="移动加权均价 (Moving Weighted Average)"
+    )
+    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime, server_default=func.now(), onupdate=func.now()
+    )
+
+    __table_args__ = (
+        UniqueConstraint("sku_id", "company_id", name="uq_sku_company"),
+    )
+
+    sku: Mapped[ProductSku | None] = relationship("ProductSku", lazy="selectin")