feat(追踪系统): 修改钢卷追踪逻辑为按钢卷号升序处理

- 前端调整位置数量从5个改为4个并更新提示信息
- 后端修改SQL查询按COILID升序获取钢卷
- 新增按钢卷号范围查询功能
- 实现追踪状态管理，支持追踪结束检测和恢复
- 优化信号处理逻辑，支持末卷重复信号处理

frontend/src/views/TrackCoil.vue

@@ -7,7 +7,7 @@
       <span style="flex:1"></span>
       <el-button size="small" type="warning" @click="triggerSignal1">模拟信号1(入口)</el-button>
       <el-button size="small" type="success" @click="triggerSignal2">模拟信号2(焊接完成)</el-button>
-      <span style="font-size:12px;color:#666">提示: Position 1对应产线入口(顺序号1), Position 5对应产线出口(顺序号5)</span>
+      <span style="font-size:12px;color:#666">提示: 追踪4个位置,按钢卷号升序(最小的先进产线)</span>
     </div>
 
     <div class="panel" style="padding:0;margin-top:10px">
@@ -21,7 +21,7 @@
           <template slot-scope="{row}">
             <el-button type="text" size="mini" @click.stop="openEdit(row)">编辑</el-button>
             <el-button type="text" size="mini" style="color:#e67e22" @click.stop="moveUp(row)" :disabled="row.position === 1">上移</el-button>
-            <el-button type="text" size="mini" style="color:#e67e22" @click.stop="moveDown(row)" :disabled="row.position === 5">下移</el-button>
+            <el-button type="text" size="mini" style="color:#e67e22" @click.stop="moveDown(row)" :disabled="row.position === 4">下移</el-button>
             <el-button type="text" size="mini" style="color:#c0392b" @click.stop="doDelete(row)">删除</el-button>
           </template>
         </el-table-column>
@@ -40,7 +40,7 @@
           <el-input-number v-model="form.rollprogramnb" :controls="false" style="width:100%" />
         </el-form-item>
         <el-form-item label="位置" prop="position">
-          <el-input-number v-model="form.position" :min="1" :max="5" :controls="false" style="width:100%" />
+          <el-input-number v-model="form.position" :min="1" :max="4" :controls="false" style="width:100%" />
         </el-form-item>
       </el-form>
       <div slot="footer">