v0.3.0: 单 sources 入口 + 路径后缀覆盖约定

破坏性重构。框架对外只暴露一个 `sources` glob 入口,消费侧任何 .vue
都按文件路径后缀匹配同后缀覆盖:

- shrimp/components/<name>.vue 同后缀覆盖框架内置(login/layout/topbar/ShrimpTable/...)
- shrimp/components/fields/Field<X>.vue 注册类型 <x>(首字母小写)
- shrimp/module/<key>.vue 业务模块

变更:
- 删除 customFields / moduleSources / overrideField / registerField 旧入口
- 删除 fieldOverrides Map,字段表纯靠 glob 扫描注册
- 框架内 .vue 对可覆盖 peer 改用 defineAsyncComponent(resolveVue(...))
  (login → ShrimpLangSwitch / layout → sideM/navMenu/topbar/userbar/logo /
   ShrimpTable → ShrimpEditDrawer/ShrimpFilterDrawer/...)
- views/ 全部并入 components/,App.vue 上提到 src/ 根
- LangSwitch → ShrimpLangSwitch,PowerTree → ShrimpPowerTree
- module/FieldRelativeTime.vue → components/fields/FieldRelativeTime.vue
- module/user.vue 改用 #column-updatedAt slot 替代旧的 overrideField

字段类型约定从 'field' + Name 改为 lowercase-first(FieldString → 'string'),
内置和消费侧统一。

src/module/role.vue

@@ -28,7 +28,7 @@
                         <el-input v-model="formData.description" type="textarea" :rows="3" />
                     </el-form-item>
                     <el-form-item :label="$t('role.powers')">
-                        <PowerTree :modelValue="formData.powers || []" :allPowers="allPowers" :menuTree="vueAdmin.menuTree"
+                        <ShrimpPowerTree :modelValue="formData.powers || []" :allPowers="allPowers" :menuTree="vueAdmin.menuTree"
                             @update:modelValue="val => formData.powers = val" />
                     </el-form-item>
                 </el-form>
@@ -48,12 +48,13 @@
 </template>
 
 <script lang="ts" setup>
-import { ref, onMounted } from 'vue'
+import { defineAsyncComponent, ref, onMounted } from 'vue'
 import { useI18n } from 'vue-i18n'
-import { vueAdmin } from '../VueAdmin'
+import { vueAdmin, resolveVue } from '../VueAdmin'
 import { IRole, IRoleProto, WithId, ILabel } from '../IShrimpType'
 import { ElMessage } from 'element-plus'
-import PowerTree from '../components/PowerTree.vue'
+
+const ShrimpPowerTree = defineAsyncComponent(resolveVue('components/ShrimpPowerTree.vue'))
 
 interface IPowerItem {
     key: string