feat: P3阶段完成 - 全部模块迁移完成 🎉

## P3.1: 争议仲裁模块（disputes）✅
- API: disputes.ts
- 模块导出

## P3.2: 卖家中心模块（seller）✅
- Views: 4个页面
- Composables: usePublishForm, usePublishDraft
- 模块导出

## P3.3: 管理后台模块（admin）✅
- API: 8个文件（adminAuth, adminDashboard, adminUsers等）
- Views: 15个管理页面
- Composables: useAdminTable, useAdminPaginatedTable
- Components: 管理端组件
- 模块导出

---

## 🎉 Features 架构迁移全部完成！

### 最终统计
- ✅ P0: shared（基础设施）- 22个文件
- ✅ P1: wallet, chats, orders - 24个文件
- ✅ P2: listings, auth - 35个文件
- ✅ P3: seller, disputes, admin - 47个文件

**总计：** 9个模块，128个文件完成迁移

### 新架构
```
frontend/src/
├── features/          # 9个业务模块 ✅
│   ├── wallet/       ✅
│   ├── chats/        ✅
│   ├── orders/       ✅ (已重构)
│   ├── listings/     ✅
│   ├── auth/         ✅
│   ├── seller/       ✅
│   ├── disputes/     ✅
│   └── admin/        ✅
└── shared/           ✅
```

下一步：清理旧文件、更新路由配置

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/features/admin/components/GeneralConfigDialog.vue

@@ -0,0 +1,134 @@
+<script setup lang="ts">
+import { ElMessage } from 'element-plus'
+import { computed, ref, watch } from 'vue'
+
+import { updateSystemConfig, type SystemConfig } from '@/api/systemConfigs'
+import { getSystemConfigSelectOptions, type SystemConfigOption } from '@/utils/systemConfigOptions'
+
+const props = defineProps<{
+  modelValue: boolean
+  config: SystemConfig
+}>()
+
+const emit = defineEmits<{
+  (e: 'update:modelValue', val: boolean): void
+  (e: 'saved'): void
+}>()
+
+const submitting = ref(false)
+const value = ref('')
+const description = ref('')
+
+watch(
+  () => props.modelValue,
+  (val) => {
+    if (val) {
+      value.value = props.config.value || ''
+      description.value = props.config.description || ''
+    }
+  },
+  { immediate: true }
+)
+
+const isStructuredConfig = computed(() => {
+  const trimmed = value.value.trim()
+  return trimmed.startsWith('{') || trimmed.startsWith('[')
+})
+
+const selectOptions = computed<SystemConfigOption[] | null>(() => {
+  const options = getSystemConfigSelectOptions(props.config.key)
+  if (!options) return null
+  if (!value.value || options.some((item) => item.value === value.value)) {
+    return options
+  }
+  return [{ label: `当前值：${value.value}`, value: value.value }, ...options]
+})
+
+async function handleSave() {
+  submitting.value = true
+  try {
+    await updateSystemConfig(props.config.key, {
+      value: value.value,
+      description: description.value,
+    })
+    ElMessage.success('配置已更新')
+    emit('saved')
+    emit('update:modelValue', false)
+  } catch (error) {
+    ElMessage.error(readError(error, '保存失败'))
+  } finally {
+    submitting.value = false
+  }
+}
+
+function readError(error: unknown, fallback: string) {
+  if (typeof error === 'object' && error && 'response' in error) {
+    const response = (error as { response?: { data?: { message?: string } } }).response
+    return response?.data?.message || fallback
+  }
+  return fallback
+}
+</script>
+
+<template>
+  <el-dialog
+    :model-value="modelValue"
+    title="编辑系统配置"
+    width="560px"
+    @update:model-value="emit('update:modelValue', $event)"
+  >
+    <div class="dialog-body">
+      <p class="config-key-label"><strong>{{ config.key }}</strong></p>
+
+      <el-form-item v-if="isStructuredConfig" label="配置值 (JSON)" class="full-control">
+        <el-input v-model="value" type="textarea" :rows="12" placeholder="配置值 JSON" />
+      </el-form-item>
+      <el-form-item v-else-if="selectOptions" label="配置值" class="full-control">
+        <el-select v-model="value" class="full-select" placeholder="请选择配置值">
+          <el-option
+            v-for="option in selectOptions"
+            :key="option.value"
+            :label="option.label"
+            :value="option.value"
+          />
+        </el-select>
+      </el-form-item>
+      <el-form-item v-else label="配置值" class="full-control">
+        <el-input v-model="value" placeholder="配置值" />
+      </el-form-item>
+
+      <el-form-item label="配置说明" class="desc-item">
+        <el-input v-model="description" type="textarea" :rows="3" placeholder="配置说明" />
+      </el-form-item>
+    </div>
+    <template #footer>
+      <el-button @click="emit('update:modelValue', false)">取消</el-button>
+      <el-button type="primary" :loading="submitting" @click="handleSave">保存</el-button>
+    </template>
+  </el-dialog>
+</template>
+
+<style scoped>
+.dialog-body {
+  display: grid;
+  gap: 16px;
+}
+
+.config-key-label {
+  margin: 0;
+  color: #374151;
+}
+
+.full-control {
+  width: 100%;
+}
+
+.full-select {
+  width: 100%;
+}
+
+.desc-item {
+  margin-top: 14px;
+  margin-bottom: 0;
+}
+</style>