fix: models/__init__ 补注册 extend.py 五模型(articles/pay_orders/devices/company_params/sms_codes)

根因: extend 模型未在 models 包导出, init_db 全新建库时缺这 5 张表,
seed 帮助文章步骤查询 articles 崩溃(本地老库碰巧有表未暴露)。
已用全新临时库完整验证: 22 表齐全, 管理员/254 样板/8 帮助文章/公告全部就绪

src/huamenchuang/models/__init__.py

@@ -14,6 +14,13 @@ from huamenchuang.models.contract import (
     StockMove,
     WarehouseItem,
 )
+from huamenchuang.models.extend import (
+    Article,
+    CompanyParam,
+    Device,
+    PayOrder,
+    SmsCode,
+)
 from huamenchuang.models.order import DEFAULT_PROCESSES, Order, OrderLog, OrderProcess
 from huamenchuang.models.user import User
 from huamenchuang.models.windoor_template import WindoorCatelog, WindoorTemplate
@@ -21,17 +28,22 @@ from huamenchuang.models.windoor_template import WindoorCatelog, WindoorTemplate
 __all__ = [
     "AfterSale",
     "Announcement",
+    "Article",
+    "CompanyParam",
     "Contract",
     "Customer",
     "DEFAULT_PROCESSES",
+    "Device",
     "MeasureOrder",
     "Order",
     "OrderLog",
     "OrderProcess",
+    "PayOrder",
     "Product",
     "ProductCatelog",
     "Quotation",
     "ReceiptAccount",
+    "SmsCode",
     "StockMove",
     "User",
     "WarehouseItem",