feat: 器械分类网格化 + 分类页标题防乱码 + 按器械/部位多维度筛选

- 首页『热门器械』由横滑 chips 改为与『按部位浏览』一致的网格
- 分类页 navbar 标题改由本地分类枚举回写，避免外部传入标题乱码
- 分类页新增二级维度多选筛选：器械维度交叉按部位，其余维度交叉按器械
- 后端 exercises.service 支持 equipment/bodyPart 逗号分隔多值 OR 过滤（向后兼容）

miniprogram/pages/category/category.js

@@ -9,6 +9,11 @@ const DIM_MAP = {
   type: 'types'
 };
 
+const SECONDARY_LABEL = {
+  bodyPart: '部位',
+  equipment: '器械'
+};
+
 function labelForDim(d) {
   return ({
     bodyPart: '按部位',
@@ -27,6 +32,12 @@ Page({
     value: '',
     values: [],
     activeValue: '',
+    // 二级维度（多维度筛选）：进入器械维度时交叉按部位，其余维度交叉按器械
+    secondaryDim: 'equipment',
+    secondaryKey: 'equipment',
+    secondaryLabel: '器械',
+    secondaryList: [],
+    secondarySelected: [],
     exercises: [],
     loading: true,
     loadingMore: false,
@@ -39,11 +50,15 @@ Page({
   onLoad(query) {
     const dimension = query.dimension || 'bodyPart';
     const value = query.value || '';
+    const secondaryDim = dimension === 'equipment' ? 'bodyPart' : 'equipment';
     const title = query.title || labelForDim(dimension);
     this.setData({
       statusBarHeight: app.globalData.statusBarHeight || 20,
       dimension,
       value,
+      secondaryDim,
+      secondaryKey: DIM_MAP[secondaryDim] || 'equipment',
+      secondaryLabel: SECONDARY_LABEL[secondaryDim] || '器械',
       title
     });
     this.loadValues();
@@ -52,14 +67,30 @@ Page({
   loadValues() {
     this.setData({ loading: true });
     const key = DIM_MAP[this.data.dimension] || 'body-parts';
-    svc.getCategories(key).then((items) => {
+    const secKey = this.data.secondaryKey;
+    Promise.all([
+      svc.getCategories(key),
+      svc.getCategories(secKey).catch(() => [])
+    ]).then(([items, secItems]) => {
       const list = (items || []).slice();
-      // 头部插入「全部」项：无 value 入参时默认选中，明确当前为「全部」
+      // 头部插入「全部」项：明确当前为「全部」
       list.unshift({ value: '', label: '全部' });
       const activeValue = this.data.value || '';
+      // 用分类枚举里的干净中文标签回写标题，避免外部传入的标题出现乱码
+      let title = this.data.title;
+      if (activeValue) {
+        const hit = list.find((it) => it.value === activeValue);
+        if (hit && hit.label) title = hit.label;
+      }
+      const secList = (secItems || []).slice().map((it) => ({
+        ...it,
+        active: this.data.secondarySelected.includes(it.value)
+      }));
       this.setData({
         values: list,
         activeValue: activeValue,
+        secondaryList: secList,
+        title,
         loading: false
       });
       this.loadExercises();
@@ -68,10 +99,19 @@ Page({
     });
   },
 
+  syncSecondaryActive() {
+    const sel = this.data.secondarySelected;
+    const list = this.data.secondaryList.map((it) => ({ ...it, active: sel.includes(it.value) }));
+    this.setData({ secondaryList: list });
+  },
+
   loadExercises() {
     this.setData({ loading: true, page: 1 });
     const params = { page: 1, pageSize: this.data.pageSize };
     params[this.data.dimension] = this.data.activeValue;
+    if (this.data.secondarySelected.length) {
+      params[this.data.secondaryDim] = this.data.secondarySelected.join(',');
+    }
     svc.listExercises(params).then((res) => {
       const items = (res && res.items) || [];
       const total = (res && res.total) || 0;
@@ -96,6 +136,9 @@ Page({
     this.setData({ loadingMore: true });
     const params = { page: next, pageSize: this.data.pageSize };
     params[this.data.dimension] = this.data.activeValue;
+    if (this.data.secondarySelected.length) {
+      params[this.data.secondaryDim] = this.data.secondarySelected.join(',');
+    }
     svc.listExercises(params).then((res) => {
       const items = (res && res.items) || [];
       const total = (res && res.total) || 0;
@@ -118,6 +161,24 @@ Page({
     this.setData({ activeValue: value, page: 1 }, () => this.loadExercises());
   },
 
+  onSecondary(e) {
+    const value = e.detail.value;
+    if (!value) return;
+    const cur = this.data.secondarySelected;
+    const next = cur.includes(value) ? cur.filter((v) => v !== value) : cur.concat(value);
+    this.setData({ secondarySelected: next, page: 1 }, () => {
+      this.syncSecondaryActive();
+      this.loadExercises();
+    });
+  },
+
+  onSecondaryClear() {
+    this.setData({ secondarySelected: [], page: 1 }, () => {
+      this.syncSecondaryActive();
+      this.loadExercises();
+    });
+  },
+
   onExercise(e) {
     if (!e || !e.detail || !e.detail.id) return;
     wx.navigateTo({ url: '/pages/detail/detail?id=' + encodeURIComponent(e.detail.id) });

miniprogram/pages/category/category.wxml

@@ -2,16 +2,35 @@
   <navbar title="{{title}}" show-back />
 
   <view class="section" style="padding-top: 8rpx;">
-    <scroll-view wx:if="{{values.length}}" scroll-x class="filterbar" style="top: calc({{statusBarHeight}}px + 88rpx);">
-      <chip
-        wx:for="{{values}}"
-        wx:key="value"
-        label="{{item.label}}"
-        value="{{item.value}}"
-        active="{{activeValue === item.value}}"
-        bind:select="onValue" />
-      <view class="filterbar__spacer"></view>
-    </scroll-view>
+    <view wx:if="{{values.length}}" class="filterbar" style="top: calc({{statusBarHeight}}px + 88rpx);">
+      <scroll-view scroll-x class="filterbar__row">
+        <chip
+          wx:for="{{values}}"
+          wx:key="value"
+          label="{{item.label}}"
+          value="{{item.value}}"
+          active="{{activeValue === item.value}}"
+          bind:select="onValue" />
+        <view class="filterbar__spacer"></view>
+      </scroll-view>
+
+      <view wx:if="{{secondaryList.length}}" class="filterbar__sub">
+        <view class="filterbar__subhead">
+          <text class="filterbar__sublabel">{{secondaryLabel}}</text>
+          <text wx:if="{{secondarySelected.length}}" class="filterbar__clear" bindtap="onSecondaryClear">清除 ({{secondarySelected.length}})</text>
+        </view>
+        <scroll-view scroll-x class="filterbar__row">
+          <chip
+            wx:for="{{secondaryList}}"
+            wx:key="value"
+            label="{{item.label}}"
+            value="{{item.value}}"
+            active="{{item.active}}"
+            bind:select="onSecondary" />
+          <view class="filterbar__spacer"></view>
+        </scroll-view>
+      </view>
+    </view>
     <view wx:else class="filterbar__loading muted">{{ loading ? '加载分类中…' : '暂无分类' }}</view>
 
     <view class="count muted" wx:if="{{!loading}}">共 {{total}} 个动作</view>

miniprogram/pages/category/category.wxss

@@ -3,12 +3,17 @@
 .filterbar {
   position: sticky;
   z-index: 40;
-  white-space: nowrap;
-  padding: 8rpx 0 4rpx;
+  padding: 8rpx 0 12rpx;
   background: var(--bg-grad);
 }
+.filterbar__row { white-space: nowrap; }
 .filterbar chip { display: inline-block; margin-right: 16rpx; }
 .filterbar__spacer { display: inline-block; width: 4rpx; }
+/* 二级维度（多维度筛选）：主维度横列下方再叠一条横列，带标签与清除 */
+.filterbar__sub { margin-top: 12rpx; padding-top: 14rpx; border-top: 1rpx solid var(--line); }
+.filterbar__subhead { display: flex; align-items: center; justify-content: space-between; padding: 0 4rpx 10rpx; }
+.filterbar__sublabel { font-size: 24rpx; color: var(--text-2); font-weight: 600; }
+.filterbar__clear { font-size: 22rpx; color: var(--accent); }
 /* 加载 / 空态占位：横列区域常驻，避免加载期间整块消失 */
 .filterbar__loading {
   font-size: 24rpx;

miniprogram/pages/index/index.wxml

@@ -124,10 +124,10 @@
     </view>
   </view>
 
-  <!-- 热门器械 -->
+  <!-- 热门器械（网格，与按部位浏览一致） -->
   <view class="section" wx:if="{{equipment.length}}">
-    <section-header eyebrow="EQUIPMENT" title="热门器械" subtitle="按器械筛选动作" />
-    <scroll-view scroll-x class="chip-scroll">
+    <section-header eyebrow="EQUIPMENT" title="按器械浏览" subtitle="选择你的训练器械" />
+    <view class="eq-grid">
       <view
         wx:for="{{equipment}}"
         wx:key="value"
@@ -135,10 +135,10 @@
         data-value="{{item.value}}"
         data-label="{{item.label}}"
         bindtap="onScanEquipment">
-        <text class="eq__name">{{item.label}}</text>
-        <text class="eq__count">{{item.count}}</text>
+        <text class="eq__label">{{item.label}}</text>
+        <text class="eq__count">{{item.count}} 个动作</text>
       </view>
-    </scroll-view>
+    </view>
   </view>
 
   <view style="height: 160rpx;"></view>

miniprogram/pages/index/index.wxss

@@ -100,12 +100,15 @@
 .bp__label { font-size: 26rpx; color: var(--text); font-weight: 600; }
 .bp__count { font-size: 20rpx; color: var(--text-3); margin-top: 6rpx; }
 
+.eq-grid { display: flex; flex-wrap: wrap; gap: 16rpx; }
 .eq {
-  display: inline-flex; align-items: center; gap: 12rpx;
-  background: var(--surface-2); border: 1rpx solid var(--line);
-  border-radius: var(--radius-pill); padding: 16rpx 28rpx; margin-right: 16rpx;
+  width: calc((100% - 48rpx) / 4);
+  background: var(--surface); border: 1rpx solid var(--line);
+  border-radius: var(--radius-sm); padding: 22rpx 12rpx;
+  display: flex; flex-direction: column; align-items: center;
 }
-.eq__name { font-size: 26rpx; color: var(--text); }
-.eq__count { font-size: 22rpx; color: var(--accent); }
+.eq:active { background: var(--surface-2); }
+.eq__label { font-size: 26rpx; color: var(--text); font-weight: 600; }
+.eq__count { font-size: 20rpx; color: var(--text-3); margin-top: 6rpx; }
 
 .empty { color: var(--text-3); font-size: var(--fs-sm); text-align: center; padding: 40rpx 0; }