feat(search): 大神关键词搜索走服务端（昵称/品类/段位/标签）

- 仓储 getCompanions(keyword?)：参数化 LIKE 搜索 name/track/rank_name/tags 及 id 精确匹配
- 接口 /api/companions 支持 ?keyword=（长度截断 40）
- 小程序 api.js getCompanions(keyword) 带 encodeURIComponent；首页监听 searchKeyword 防抖 350ms 走服务端搜索，搜索态以服务端结果为准（含空结果不展示陈旧数据）
- 回归 95 套件/668 用例全绿；冒烟 4/4（昵称/品类命中、无匹配空数组、无关键词向后兼容）

pwuniapp/common/api.js

@@ -191,10 +191,12 @@ export async function getMyActivities(userId) {
 /**
  * 获取同城大神列表
  */
-export async function getCompanions() {
+export async function getCompanions(keyword) {
   try {
-    const list = await http.get('/companions');
-    if (Array.isArray(list) && list.length > 0) {
+    const kw = String(keyword == null ? '' : keyword).trim();
+    const query = kw ? `?keyword=${encodeURIComponent(kw)}` : '';
+    const list = await http.get(`/companions${query}`);
+    if (Array.isArray(list)) {
       return list
         .filter((c) => !c.auditStatus || c.auditStatus === '已通过')
         .map((c) => ({

pwuniapp/pages/index/index.vue

@@ -266,7 +266,7 @@
 </template>
 
 <script setup>
-import { ref, computed, onMounted, onUnmounted } from 'vue';
+import { ref, computed, watch, onMounted, onUnmounted } from 'vue';
 import { onLoad, onShow } from '@dcloudio/uni-app';
 import AppTabBar from '@/components/CustomTabBar.vue';
 import SkeletonScreen from '@/components/SkeletonScreen.vue';
@@ -352,17 +352,32 @@ const loadInitialData = async () => {
   }
 };
 
-const fetchLiveCompanions = async () => {
+const fetchLiveCompanions = async (keyword = '') => {
   try {
-    const list = await getCompanions();
-    if (Array.isArray(list) && list.length > 0) {
-      experts.value = list;
+    const kw = String(keyword || '').trim();
+    const list = await getCompanions(kw);
+    if (Array.isArray(list)) {
+      if (kw) {
+        // 服务端搜索：以服务端结果为准（含空结果），避免仅过滤已加载的一页数据
+        experts.value = list;
+      } else if (list.length > 0) {
+        experts.value = list;
+      }
     }
   } catch (err) {
     console.warn('[Index] 获取大神数据失败:', err);
   }
 };
 
+// 关键词变化时防抖走服务端搜索，覆盖超出当前加载范围的候选
+let searchTimer = null;
+watch(searchKeyword, (val) => {
+  if (searchTimer) clearTimeout(searchTimer);
+  searchTimer = setTimeout(() => {
+    fetchLiveCompanions(String(val || '').trim());
+  }, 350);
+});
+
 const fetchLiveBanners = async () => {
   try {
     const list = await getBanners();