refactor: relay存储原始hex值(relay_code)，前端解码显示

- tb_state_tst新增relay_code TINYINT列，ALTER TABLE自动迁移
- edc_server: B2/B4都以原始int值插入relay_code
- edc-web: decodeRelay()解码 0=无输出/1=存在信号/2=脉冲信号/3=存在+脉冲
- relay_out VARCHAR列保留兼容旧数据

edc-web/app/static/js/test_data.js

@@ -35,7 +35,7 @@ const VIEWS = {
             { key: 'test_mode',     title: '测试模式',   render: r => r.test_mode === 1 ? '波动' : '灵敏度' },
             { key: 'iffinish',      title: '完成',       render: r => r.iffinish === '1' ? '是' : '否' },
             { key: 'fault_info',    title: '故障信息' },
-            { key: 'relay_out',     title: '继电器' },
+            { key: 'relay_out',     title: '继电器',    render: r => decodeRelay(r.relay_code) },
             { key: 'ppvalue',       title: '峰峰值(V)',  render: r => r.ppvalue?.toFixed(2) || '-' },
             { key: 'idle_freq',     title: '开始频率' },
             { key: 'enter_freq',    title: '进入频率' },
@@ -62,7 +62,7 @@ const VIEWS = {
             { key: 'far_dist',      title: '最远距离(mm)' },
             { key: 'b4_enter_dist', title: '进入高度(mm)' },
             { key: 'b4_leave_dist', title: '离开高度(mm)' },
-            { key: 'relay_out',     title: '继电器' },
+            { key: 'relay_out',     title: '继电器',    render: r => decodeRelay(r.relay_code) },
                         { key: 'create_time',   title: '时间',      render: r => fmtTime(r.create_time) },
         ],
     },
@@ -92,6 +92,17 @@ function fmtTime(v) {
     return `${y}-${m}-${d2} ${h}:${min}:${s}`;
 }
 
+const RELAY_MAP = {
+    0: '无输出',
+    1: '存在信号',
+    2: '脉冲信号',
+    3: '存在信号; 脉冲信号',
+};
+function decodeRelay(v) {
+    if (v === null || v === undefined || v === '') return '-';
+    return RELAY_MAP[parseInt(v)] || `0x${parseInt(v).toString(16).toUpperCase().padStart(2, '0')}`;
+}
+
 // ─── 视图切换 ────────────────────────────────────
 
 function switchView(view) {