feat: DG430 V2.0.3 — 波动测试模式 前端+后端同步

edc_server:
  - dg430.py: 新增0xB4解析; 0x4C扩展6字段(向后兼容)
  - models.py: tb_fixture_param DDL + upsert 新增6字段
  - handlers.py: parse_loop 添加0xB4处理; 0x4C传参扩展

edc-web:
  - fixture.py: build_4b_packet() 新增6个波动参数
  - models.py: upsert_fixture_param 字段列表扩展
  - fixture.html: 新增波动测试参数输入区(6字段)
  - fixture.js: getFormParams/fillForm/saveToDb/sendConfig 全部扩展

edc-web/app/models.py

@@ -417,6 +417,7 @@ def upsert_fixture_param(dnt_id: int, **kwargs):
             fields = [
                 "Addr", "DevType", "TestMode", "RestDis", "MinusDis",
                 "SensMin", "SensMax", "FreMin", "FreMax", "PeakMin", "PeakMax",
+                "FarTol", "NearTol", "StepTol", "BackForth", "NearStay", "FarStay",
             ]
             if existing:
                 sets = ", ".join(f"`{f}`=%s" for f in fields)