feat: 完成 issue #3 边缘采集网关模板化封装

- 点位字典 CSV schema/加载/自动校验（缺失字段/量纲/重复点号，PRD 5.1）
- 协议可插拔只读驱动：OPC UA(S7-1200 适配)/S7/Modbus/称重/能源/模拟
- 周期采集引擎：只读+背压保护+健康度指标（丢失率/P99/可用性）
- Kafka 流式上行 + 本地 spool 断点续传（丢失率≤0.02% 保障）
- 模板配置外置（gateway.yaml + 点位字典 CSV），换行业零改码
- 18 个单元测试全绿；端到端运行 SLA 达标

core/edge-gateway/tests/test_loader.py

@@ -0,0 +1,59 @@
+# -*- coding: utf-8 -*-
+"""点位字典加载器测试。"""
+import os
+import tempfile
+import unittest
+
+from point_dict.loader import load_point_dict_csv
+
+GOOD_CSV = """device_id,point_id,name,unit,dataType,sampleRate,qualityCode,opcNode
+CLF-01,CLF-01.TEMP,炉温,℃,float,1000,true,ns=2;s=CLF.Temp
+CLF-01,CLF-01.PRES,炉压,kPa,float,1000,,ns=2;s=CLF.Pres
+"""
+
+
+class LoaderTest(unittest.TestCase):
+    def setUp(self):
+        self._tmp = tempfile.mkdtemp()
+        self.path = os.path.join(self._tmp, "points.csv")
+
+    def _write(self, content):
+        with open(self.path, "w", encoding="utf-8") as fh:
+            fh.write(content)
+        return self.path
+
+    def test_load_valid_csv(self):
+        path = self._write(GOOD_CSV)
+        pd = load_point_dict_csv(path)
+        self.assertEqual(len(pd), 2)
+        p0 = pd.points[0]
+        self.assertEqual(p0.device_id, "CLF-01")
+        self.assertEqual(p0.point_id, "CLF-01.TEMP")
+        self.assertEqual(p0.unit, "℃")
+        self.assertEqual(p0.data_type, "float")
+        self.assertEqual(p0.sample_rate, 1000)
+        self.assertTrue(p0.quality_code)
+        self.assertEqual(p0.opc_node, "ns=2;s=CLF.Temp")
+        self.assertEqual(p0.row_number, 2)
+
+    def test_quality_code_default_true(self):
+        """qualityCode 列留空时默认 true。"""
+        path = self._write(GOOD_CSV)
+        pd = load_point_dict_csv(path)
+        self.assertTrue(pd.points[1].quality_code)
+
+    def test_utf8_bom_tolerated(self):
+        path = self._write("\ufeff" + GOOD_CSV)
+        pd = load_point_dict_csv(path)
+        self.assertEqual(len(pd), 2)
+
+    def test_grouping_by_device(self):
+        path = self._write(GOOD_CSV)
+        pd = load_point_dict_csv(path)
+        grouped = pd.by_device_id()
+        self.assertEqual(set(grouped.keys()), {"CLF-01"})
+        self.assertEqual(len(grouped["CLF-01"]), 2)
+
+
+if __name__ == "__main__":
+    unittest.main()