docs: explain stylesheet ownership, responsive rules and display boundaries

app/assets/styles/OsIcon.CAi4Iz2S.css

@@ -1,3 +1,5 @@
+/* 操作系统图标：统一尺寸与未知系统的占位图形。 */
+/* 导入方：app/components/HostList.vue、app/components/OsIcon.vue、app/components/config/CommonConfig.vue、app/components/config/ConfigChoiceGrid.vue、app/components/config/ConfigResourceOption.vue、app/components/config/FinanceConfig.vue、app/components/config/JyCloudConfig.vue、app/components/config/KkyEcsConfig.vue、app/components/config/MfCloudConfig.vue、app/components/config/MfDcimConfig.vue、app/components/instance/DcimManage.vue、app/components/instance/InstanceAccess.vue、app/components/instance/InstanceManage.vue、app/components/instance/InstanceOverview.vue、app/components/instance/LegacyDcimManage.vue、app/pages/cloud-servers/index.vue、app/pages/dedicated-servers/index.vue、app/pages/products/[id].vue、app/pages/products/cloud-server.vue、app/pages/products/dedicated-server/customize.vue。 */
 .os-icon[data-v-01907ce4] {
   -o-object-fit: contain;
   object-fit: contain;