重构: 手续费改为百分比/固定二选一，清理旧 Skin/Order/ShipLog 演示链路

手续费:
- 新增 fee_type 字段(rate/fixed)，百分比与固定金额二选一，不再叠加
- calculateServiceFee 按 fee_type 分支计算
- 商户创建/更新校验 fee_type，订单落库快照 fee_type
- 前端表单改为下拉选择手续费类型，动态显示对应输入框
- 测试拆为 TestFeeRate + TestFeeFixed

清理旧链路:
- 删除旧 Skin/Order/ShipLog 模型及 OrderService/SkinService
- Dashboard 迁移到 FulfillmentService
- 上游 /api/open/v1 改为基于 FulfillmentOrder 实现，接口契约不变
- 推送留痕改用 AuditLog，不再建 ShipLog 表
- 删除前端 Skins/Orders/ShipLogs/Distributors 页面及路由、菜单、API、类型
- 新增迁移 003: 添加 fee_type 列并 DROP 旧表

frontend/src/pages/PlatformMerchants.tsx

@@ -26,14 +26,24 @@ const memberRoleOptions = [
   { value: 'viewer', label: '只读' },
 ]
 
+const featureOptions = [
+  { value: 'products', label: '商品' },
+  { value: 'orders', label: '订单' },
+  { value: 'wallet', label: '钱包' },
+  { value: 'api', label: 'API' },
+  { value: 'callbacks', label: '回调' },
+]
+
 export default function PlatformMerchants() {
   const navigate = useNavigate()
   const [data, setData] = useState<PageResult<Merchant>>({ list: [], total: 0, page: 1, size: 10 })
   const [loading, setLoading] = useState(false)
   const [createOpen, setCreateOpen] = useState(false)
+  const [settingsOpen, setSettingsOpen] = useState(false)
   const [memberOpen, setMemberOpen] = useState(false)
   const [selectedMerchant, setSelectedMerchant] = useState<Merchant | null>(null)
   const [createForm] = Form.useForm()
+  const [settingsForm] = Form.useForm()
   const [memberForm] = Form.useForm()
 
   const load = useCallback(async (page = data.page, size = data.size) => {
@@ -55,7 +65,13 @@ export default function PlatformMerchants() {
   const submitCreate = async () => {
     const values = await createForm.validateFields()
     try {
-      await platformApi.createMerchant(values)
+      await platformApi.createMerchant({
+        ...values,
+        features: featureListToText(values.features),
+        fee_type: values.fee_type,
+        fee_rate_bp: Number(values.fee_rate_bp || 0),
+        fee_fixed_amount: yuanToCents(values.fee_fixed_yuan),
+      })
       message.success('商户已创建')
       setCreateOpen(false)
       createForm.resetFields()
@@ -65,6 +81,28 @@ export default function PlatformMerchants() {
     }
   }
 
+  const submitSettings = async () => {
+    if (!selectedMerchant) return
+    const values = await settingsForm.validateFields()
+    try {
+      await platformApi.updateMerchant(selectedMerchant.id, {
+        name: values.name,
+        status: values.status,
+        contact_name: values.contact_name,
+        contact_info: values.contact_info,
+        features: featureListToText(values.features),
+        fee_type: values.fee_type,
+        fee_rate_bp: Number(values.fee_rate_bp || 0),
+        fee_fixed_amount: yuanToCents(values.fee_fixed_yuan),
+      })
+      message.success('商户设置已更新')
+      setSettingsOpen(false)
+      load()
+    } catch (e) {
+      message.error(e instanceof Error ? e.message : '更新失败')
+    }
+  }
+
   const submitMember = async () => {
     if (!selectedMerchant) return
     const values = await memberForm.validateFields()
@@ -87,6 +125,27 @@ export default function PlatformMerchants() {
     { title: '名称', dataIndex: 'name', ellipsis: true },
     { title: '联系人', dataIndex: 'contact_name', width: 120, render: (v) => v || '-' },
     { title: '联系方式', dataIndex: 'contact_info', width: 160, render: (v) => v || '-' },
+    {
+      title: '手续费',
+      key: 'fee',
+      width: 160,
+      render: (_, r) =>
+        r.fee_type === 'fixed'
+          ? `固定 ¥${centsToYuan(r.fee_fixed_amount).toFixed(2)}/单`
+          : `${(r.fee_rate_bp / 100).toFixed(2)}%`,
+    },
+    {
+      title: '功能',
+      dataIndex: 'features',
+      width: 220,
+      render: (v) => (
+        <Space size={4} wrap>
+          {featuresToList(v).map((feature) => (
+            <Tag key={feature}>{featureText(feature)}</Tag>
+          ))}
+        </Space>
+      ),
+    },
     { title: '状态', dataIndex: 'status', width: 90, render: (v) => v === 'active' ? <Tag color="green">启用</Tag> : <Tag>禁用</Tag> },
     { title: '创建时间', dataIndex: 'created_at', width: 160, render: (v) => dayjs(v).format('YYYY-MM-DD HH:mm') },
     {
@@ -106,6 +165,22 @@ export default function PlatformMerchants() {
           >
             进入
           </Button>
+          <Button
+            type="link"
+            size="small"
+            onClick={() => {
+              setSelectedMerchant(record)
+              settingsForm.setFieldsValue({
+                ...record,
+                features: featuresToList(record.features),
+                fee_type: record.fee_type || 'rate',
+                fee_fixed_yuan: centsToYuan(record.fee_fixed_amount),
+              })
+              setSettingsOpen(true)
+            }}
+          >
+            设置
+          </Button>
           <Button
             type="link"
             size="small"
@@ -142,6 +217,12 @@ export default function PlatformMerchants() {
             icon={<PlusOutlined />}
             onClick={() => {
               createForm.resetFields()
+              createForm.setFieldsValue({
+                features: featureOptions.map((item) => item.value),
+                fee_type: 'rate',
+                fee_rate_bp: 0,
+                fee_fixed_yuan: 0,
+              })
               setCreateOpen(true)
             }}
           >
@@ -166,7 +247,7 @@ export default function PlatformMerchants() {
         }}
       />
 
-      <Modal title="新增商户" open={createOpen} onOk={submitCreate} onCancel={() => setCreateOpen(false)} destroyOnClose>
+      <Modal title="新增商户" open={createOpen} onOk={submitCreate} onCancel={() => setCreateOpen(false)} destroyOnClose width={680}>
         <Form form={createForm} layout="vertical" style={{ marginTop: 16 }}>
           <Form.Item name="code" label="商户编码" rules={[{ required: true }]}>
             <Input placeholder="lower-case-code" />
@@ -174,15 +255,92 @@ export default function PlatformMerchants() {
           <Form.Item name="name" label="商户名称" rules={[{ required: true }]}>
             <Input />
           </Form.Item>
-          <Form.Item name="owner_user_id" label="负责人用户 ID" rules={[{ required: true }]}>
-            <InputNumber min={1} precision={0} style={{ width: '100%' }} />
-          </Form.Item>
-          <Form.Item name="contact_name" label="联系人">
-            <Input />
-          </Form.Item>
+          <Space size="middle" style={{ width: '100%' }}>
+            <Form.Item name="owner_username" label="负责人用户名" rules={[{ required: true }]} style={{ width: 300 }}>
+              <Input />
+            </Form.Item>
+            <Form.Item name="owner_password" label="负责人密码" rules={[{ required: true, min: 6 }]} style={{ width: 300 }}>
+              <Input.Password />
+            </Form.Item>
+          </Space>
+          <Space size="middle" style={{ width: '100%' }}>
+            <Form.Item name="owner_nickname" label="负责人昵称" style={{ width: 300 }}>
+              <Input />
+            </Form.Item>
+            <Form.Item name="contact_name" label="联系人" style={{ width: 300 }}>
+              <Input />
+            </Form.Item>
+          </Space>
           <Form.Item name="contact_info" label="联系方式">
             <Input />
           </Form.Item>
+          <Form.Item name="features" label="开通功能" rules={[{ required: true }]}>
+            <Select mode="multiple" options={featureOptions} />
+          </Form.Item>
+          <Form.Item name="fee_type" label="手续费类型" rules={[{ required: true }]}>
+            <Select
+              options={[
+                { value: 'rate', label: '按百分比（每单按订单金额比例收取）' },
+                { value: 'fixed', label: '按固定金额（每单固定手续费）' },
+              ]}
+            />
+          </Form.Item>
+          <Form.Item noStyle shouldUpdate={(prev, cur) => prev.fee_type !== cur.fee_type}>
+            {({ getFieldValue }) =>
+              getFieldValue('fee_type') === 'fixed' ? (
+                <Form.Item name="fee_fixed_yuan" label="每单固定手续费（元）" rules={[{ required: true }]}>
+                  <InputNumber min={0} precision={2} style={{ width: '100%' }} />
+                </Form.Item>
+              ) : (
+                <Form.Item name="fee_rate_bp" label="手续费比例 BP（1BP=0.01%，如 250=2.5%）" rules={[{ required: true }]}>
+                  <InputNumber min={0} max={10000} precision={0} style={{ width: '100%' }} />
+                </Form.Item>
+              )
+            }
+          </Form.Item>
+        </Form>
+      </Modal>
+
+      <Modal title={selectedMerchant ? `商户设置：${selectedMerchant.name}` : '商户设置'} open={settingsOpen} onOk={submitSettings} onCancel={() => setSettingsOpen(false)} destroyOnClose width={680}>
+        <Form form={settingsForm} layout="vertical" style={{ marginTop: 16 }}>
+          <Form.Item name="name" label="商户名称" rules={[{ required: true }]}>
+            <Input />
+          </Form.Item>
+          <Space size="middle" style={{ width: '100%' }}>
+            <Form.Item name="status" label="状态" style={{ width: 300 }}>
+              <Select options={[{ value: 'active', label: '启用' }, { value: 'disabled', label: '禁用' }]} />
+            </Form.Item>
+            <Form.Item name="contact_name" label="联系人" style={{ width: 300 }}>
+              <Input />
+            </Form.Item>
+          </Space>
+          <Form.Item name="contact_info" label="联系方式">
+            <Input />
+          </Form.Item>
+          <Form.Item name="features" label="开通功能" rules={[{ required: true }]}>
+            <Select mode="multiple" options={featureOptions} />
+          </Form.Item>
+          <Form.Item name="fee_type" label="手续费类型" rules={[{ required: true }]}>
+            <Select
+              options={[
+                { value: 'rate', label: '按百分比（每单按订单金额比例收取）' },
+                { value: 'fixed', label: '按固定金额（每单固定手续费）' },
+              ]}
+            />
+          </Form.Item>
+          <Form.Item noStyle shouldUpdate={(prev, cur) => prev.fee_type !== cur.fee_type}>
+            {({ getFieldValue }) =>
+              getFieldValue('fee_type') === 'fixed' ? (
+                <Form.Item name="fee_fixed_yuan" label="每单固定手续费（元）" rules={[{ required: true }]}>
+                  <InputNumber min={0} precision={2} style={{ width: '100%' }} />
+                </Form.Item>
+              ) : (
+                <Form.Item name="fee_rate_bp" label="手续费比例 BP（1BP=0.01%，如 250=2.5%）" rules={[{ required: true }]}>
+                  <InputNumber min={0} max={10000} precision={0} style={{ width: '100%' }} />
+                </Form.Item>
+              )
+            }
+          </Form.Item>
         </Form>
       </Modal>
 
@@ -208,3 +366,26 @@ export default function PlatformMerchants() {
     </div>
   )
 }
+
+function featuresToList(features?: string) {
+  return (features || '')
+    .split(/[,\s]+/)
+    .map((item) => item.trim())
+    .filter(Boolean)
+}
+
+function featureListToText(features?: string[]) {
+  return (features || []).join(',')
+}
+
+function featureText(feature: string) {
+  return featureOptions.find((item) => item.value === feature)?.label || feature
+}
+
+function yuanToCents(value?: number | null) {
+  return Math.round(Number(value || 0) * 100)
+}
+
+function centsToYuan(value?: number | null) {
+  return Number(((value || 0) / 100).toFixed(2))
+}