完善配送合同关联信息展示与归属校验

三端合同页面改为优先显示用户、气站和配送点业务名称，并保留标识与合同编号复制能力。

平台端增加气站与直属配送点联动，后端禁止平台主管及跨气站配送点绑定合同，同时补充测试和中文文档。

frontend/gas_admin/src/api/resources.ts

@@ -30,6 +30,8 @@ export type ResourceField = {
   placeholder?: string;
   showIdentityCopy?: boolean;
   readonlyRelationText?: boolean;
+  /** 列表中以可悬浮、可复制的紧凑文本展示普通字段。 */
+  listCopyable?: boolean;
   options?: Array<{ label: string; value: string | number }>;
   defaultValue?: string | number | boolean;
   readonly?: boolean;
@@ -451,7 +453,7 @@ const gasOverrides: ResourceUiDefinition[] = [
     { name: '重置密码', resource: '/user_account/:identity/password', method: 'PUT', fields: [f('password', { required: true })] },
   ]),
   define('user_address', '用户地址', 'writable', [relation('user_account_identity', '/user_account', true), f('address', { required: true }), f('longitude'), f('latitude'), f('is_default')]),
-  define('gasorder_contract', '配送合同', 'managed', [f('contract_no', { required: true }), relation('user_account_identity', '/user_account', true), relation('delivery_basic_identity', '/delivery_basic'), f('title', { required: true }), f('terms'), f('file_uri'), f('default_delivery_fee'), f('signed_at', { required: true }), f('effective_at', { required: true }), f('expired_at')], 'list', [
+  define('gasorder_contract', '配送合同', 'managed', [f('contract_no', { required: true, listCopyable: true }), relation('user_account_identity', '/user_account', true, { label: '用户账户', listLabel: '用户账户', listRelationNameOnly: true, showIdentityCopy: true, readonlyRelationText: true }), relation('delivery_basic_identity', '/delivery_basic', false, { label: '所属配送点', listLabel: '所属配送点', listRelationNameOnly: true, emptyText: '暂未指定', placeholder: '请选择默认配送点，可留空', showIdentityCopy: true }), f('title', { required: true }), f('terms'), f('file_uri'), f('default_delivery_fee'), f('signed_at', { required: true }), f('effective_at', { required: true }), f('expired_at')], 'list', [
     { name: '启用合同', resource: '/gasorder_contract/:identity/activate', fields: reason, visibleFor: { field: 'contract_status', values: [10] } },
     { name: '续签合同', resource: '/gasorder_contract/:identity/renew', fields: [f('effective_at', { required: true }), f('expired_at'), ...reason], visibleFor: { field: 'contract_status', values: [11, 12, 13] } },
     { name: '终止合同', resource: '/gasorder_contract/:identity/terminate', danger: true, fields: reason, visibleFor: { field: 'contract_status', values: [11] } },

frontend/gas_admin/src/views/shared/CrudListPage.vue

@@ -38,6 +38,7 @@
           <template #cell="{ record }">
             <RelationNameText v-if="field.listRelationNameOnly && identityFieldValue(field, record)" :name="relationListName(field, record)" :identity="identityFieldValue(field, record)" :identity-label="field.label" />
             <IdentityText v-else-if="field.type === 'identity' && identityFieldValue(field, record)" :value="identityFieldValue(field, record)" />
+            <IdentityText v-else-if="field.listCopyable && record[field.key]" :value="String(record[field.key])" />
             <template v-else>{{ displayFieldValue(field, record) }}</template>
           </template>
         </a-table-column>
@@ -189,6 +190,7 @@
     <a-descriptions :column="1" bordered>
       <a-descriptions-item v-for="[key, value] in detailEntries" :key="key" :label="fieldLabel(key)">
         <pre v-if="typeof value === 'object'" class="json-value">{{ formatValue(value) }}</pre>
+        <RelationNameText v-else-if="relationDetailField(key) && value" :name="relationListName(relationDetailField(key)!, detail)" :identity="String(value)" :identity-label="relationDetailField(key)!.label" />
         <template v-else>{{ displayValue(key, value) }}</template>
       </a-descriptions-item>
     </a-descriptions>
@@ -1052,6 +1054,11 @@ function displayValue(key: string, value: unknown) {
   return String(value);
 }
 
+// relationDetailField 将详情中的关联标识映射回资源字段，以复用业务名称展示和标识复制。
+function relationDetailField(key: string) {
+  return props.definition.fields.find((field) => field.key === key && field.relation);
+}
+
 /** 将各管理端稳定角色编码转换为中文名称，未知编码保留审计线索。 */
 function accountRoleLabel(resource: string | undefined, value: unknown) {
   const code = String(value ?? '');