feat(api): 新增小程序用户端与后台管理端 v1 业务接口（62 端点）

一、基础设施
- route.php：58 条路由覆盖 /api/v1/**；:id 用 \d+ 约束、长路径优先
- api/controller/V1.php：响应适配为 {code,message,data}（FastAdmin 原生 {code,msg,time,data} 不兼容）；
  Authorization Bearer 鉴权；统一分页；业务公共 userInfo/ext/flow/notify/adminLog
- admin/command/FcInstall.php：19 张 fa_fc_* 表 + 种子数据，幂等可重跑

二、控制器 17 个
- 用户端 Auth/Home/Post/Member/Distribution/Message/Setting
- 后台端 AdminDashboard/AdminMerchant/AdminMember/AdminPost/AdminComment/
  AdminDist/AdminOrder/AdminFinance/AdminRbac/AdminSetting

三、契约一致性
- 字段与小程序 common/mock/data.js 逐字段对齐，Mock 与真实接口可对拍
- 实现 BR-01~BR-12，错误文案与前端 mock 完全一致
- 详情联系方式强制脱敏，付费/会员方可解锁

四、验证
- tools/verify-api.mjs：63 端点契约 + 12 条业务规则 + 8 步双端闭环
- docs/05-后端实现规范.md

application/api/controller/AdminMember.php

@@ -0,0 +1,110 @@
+<?php
+
+namespace app\api\controller;
+
+use think\Db;
+
+/**
+ * 后台管理端 · 会员管理（Module-ADM-MEMBER）
+ * 路由：
+ *   GET  /api/v1/admin/users            AMB1 用户列表
+ *   POST /api/v1/admin/member/benefit   AMB2 会员权益配置
+ */
+class AdminMember extends V1
+{
+    /**
+     * AMB1 用户列表
+     * GET /api/v1/admin/users 入参 {page,size}
+     * → 分页 {list:[{id,nickname,phone,userType,isMember,status,registerAt}],page,size,total,hasMore}
+     */
+    public function users()
+    {
+        list($page, $size) = $this->pager();
+
+        $query = Db::name('user')->alias('u')
+            ->join('fc_user_ext e', 'e.user_id = u.id', 'LEFT');
+        $total = (int)$query->count();
+        $rows = $query->field('u.id,u.nickname,u.mobile,u.status,u.jointime,e.user_type,e.is_member,e.member_expiretime')
+            ->order('u.id desc')
+            ->page($page, $size)
+            ->select();
+
+        $now = time();
+        $list = [];
+        foreach ($rows as $row) {
+            $isMember = (int)$row['is_member'] === 1
+                && (!$row['member_expiretime'] || (int)$row['member_expiretime'] > $now);
+            $list[] = [
+                'id'         => (int)$row['id'],
+                'nickname'   => (string)$row['nickname'],
+                'phone'      => (string)$row['mobile'],
+                'userType'   => (int)$row['user_type'],
+                'isMember'   => $isMember,
+                'status'     => $row['status'] === 'normal' ? 1 : 0,
+                'registerAt' => $this->iso($row['jointime']),
+            ];
+        }
+
+        $this->ok($this->paginate($list, $total, $page, $size));
+    }
+
+    /**
+     * AMB2 会员权益配置
+     * POST /api/v1/admin/member/benefit 入参 {freeView,postDiscount,distRate,benefits[]}
+     * → {freeView,postDiscount,distRate,benefits[]}
+     * 未被传入的字段保持原值；freeView <0 报错
+     */
+    public function saveBenefit()
+    {
+        $current = $this->cfg('member.benefit', []);
+        if (!is_array($current)) {
+            $current = [];
+        }
+
+        $freeView = $this->input('freeView', null);
+        if ($freeView !== null && $freeView !== '') {
+            if ((int)$freeView < 0) {
+                $this->fail('免费查看条数不能为负');
+            }
+            $current['freeView'] = (int)$freeView;
+        }
+
+        $postDiscount = $this->input('postDiscount', null);
+        if ($postDiscount !== null && $postDiscount !== '') {
+            $current['postDiscount'] = (string)$postDiscount;
+        }
+
+        $distRate = $this->input('distRate', null);
+        if ($distRate !== null && $distRate !== '') {
+            $current['distRate'] = (string)$distRate;
+        }
+
+        $benefits = $this->input('benefits', null);
+        if ($benefits !== null && $benefits !== '') {
+            if (is_array($benefits)) {
+                $current['benefits'] = array_values($benefits);
+            } else {
+                $decoded = json_decode((string)$benefits, true);
+                $current['benefits'] = is_array($decoded) ? $decoded : [(string)$benefits];
+            }
+        }
+
+        $defaults = [
+            'freeView'     => 20,
+            'postDiscount' => '8 折',
+            'distRate'     => '一级 20% / 二级 10%',
+            'benefits'     => [],
+        ];
+        $current = array_merge($defaults, $current);
+
+        $this->setCfg('member.benefit', $current);
+        $this->adminLog('修改会员权益配置');
+
+        $this->ok([
+            'freeView'     => (int)$current['freeView'],
+            'postDiscount' => (string)$current['postDiscount'],
+            'distRate'     => (string)$current['distRate'],
+            'benefits'     => array_values((array)$current['benefits']),
+        ]);
+    }
+}