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/tests/api/test_sales_invoice.py

@@ -0,0 +1,39 @@
+"""
+销项发票模块测试 —— /api/finance/sales-invoices
+"""
+import uuid
+import pytest
+from httpx import AsyncClient
+from tests.conftest import CUSTOMER_ID
+
+
+class TestSalesInvoice:
+
+    async def test_list_sales_invoices(self, client: AsyncClient, admin_headers):
+        """销项发票列表 → 200"""
+        resp = await client.get("/api/finance/sales-invoices", headers=admin_headers)
+        assert resp.status_code == 200
+        data = resp.json()["data"]
+        assert "total" in data
+
+    async def test_create_sales_invoice(self, client: AsyncClient, admin_headers):
+        """创建销项发票 → 200"""
+        resp = await client.post("/api/finance/sales-invoices", headers=admin_headers, json={
+            "issuer": "测试润滑油有限公司",
+            "receiver_customer_id": str(CUSTOMER_ID),
+            "invoice_number": "INV-2026-001",
+            "amount": 5000.00,
+            "billing_date": "2026-03-20",
+        })
+        assert resp.status_code == 200
+        data = resp.json()["data"]
+        assert data["invoice_number"] == "INV-2026-001"
+
+    async def test_get_nonexistent_invoice(self, client: AsyncClient, admin_headers):
+        """不存在的发票详情 → 404"""
+        fake_id = uuid.uuid4()
+        resp = await client.get(
+            f"/api/finance/sales-invoices/{fake_id}",
+            headers=admin_headers
+        )
+        assert resp.status_code in (404, 500)