新增车辆表及OTA权限与逻辑优化

新增车辆任务与报警表，完善实体与DbContext配置。细化OTA权限校验，增强回传会话IP安全。优化OTA上传与设置面板，调度器支持重启恢复。报警采集逻辑支持历史分段。

frontends/apps/simple-platform-vue/src/views/shared/VehicleHubView.vue

@@ -148,7 +148,7 @@ const auth = useAuthStore()
 const canWrite = computed(() => {
   if (auth.scope === 'Platform') return true
   const ops = auth.effectivePermissions?.allowedOps ?? []
-  return ops.includes('*') || ops.some((o) => o === 'ops.ota' || o.startsWith('ops.ota.'))
+  return ops.includes('*') || ops.some((o) => o === 'ops.ota' || o === 'ops.ota.write' || o.startsWith('ops.ota.'))
 })
 
 // Tab 与 URL ?tab= 同步，支持深链接（旧 /config/vehicle、/config/fleet 已下线，统一进车辆运维）。

frontends/apps/simple-platform-vue/src/views/shared/ota/OtaSettingsPane.vue

@@ -21,18 +21,10 @@
       <el-form-item label="超限策略">
         <el-radio-group v-model="form.overThreshold">
           <el-radio value="skip">跳过该车</el-radio>
-          <el-radio value="confirm">仍允许（需确认）</el-radio>
+          <el-radio value="confirm">仍允许下发</el-radio>
         </el-radio-group>
       </el-form-item>
 
-      <h4>备份</h4>
-      <el-form-item label="周期 (分钟)">
-        <el-input-number v-model="form.backupPeriodMinutes" :min="0" :max="10080" />
-      </el-form-item>
-      <el-form-item label="备份可执行文件">
-        <el-switch v-model="form.backupExe" />
-      </el-form-item>
-
       <h4>展示</h4>
       <el-form-item label="目标版本名称">
         <el-input v-model="form.newVersionName" placeholder="可选显示名" />