feat: init fitness-coach (backend + miniprogram)

- backend: NestJS service with exercise/plan data
- miniprogram: WeChat mini program client
- exclude node_modules, dist, runtime data-store, local env

miniprogram/pages/category/category.js

@@ -0,0 +1,89 @@
+const app = getApp();
+const svc = require('../../services/exercise');
+
+const DIM_MAP = {
+  bodyPart: 'body-parts',
+  equipment: 'equipment',
+  target: 'targets',
+  muscleGroup: 'muscle-groups',
+  type: 'types'
+};
+
+function labelForDim(d) {
+  return ({
+    bodyPart: '按部位',
+    equipment: '按器械',
+    target: '按目标',
+    muscleGroup: '按肌群',
+    type: '按类型'
+  })[d] || '分类';
+}
+
+Page({
+  data: {
+    statusBarHeight: 20,
+    dimension: 'bodyPart',
+    title: '分类',
+    value: '',
+    values: [],
+    activeValue: '',
+    exercises: [],
+    loading: true,
+    page: 1,
+    pageSize: 20,
+    total: 0
+  },
+
+  onLoad(query) {
+    const dimension = query.dimension || 'bodyPart';
+    const value = query.value || '';
+    const title = query.title || labelForDim(dimension);
+    this.setData({
+      statusBarHeight: app.globalData.statusBarHeight || 20,
+      dimension,
+      value,
+      title
+    });
+    this.loadValues();
+  },
+
+  loadValues() {
+    this.setData({ loading: true });
+    const key = DIM_MAP[this.data.dimension] || 'body-parts';
+    svc.getCategories(key).then((items) => {
+      this.setData({
+        values: items || [],
+        activeValue: this.data.value,
+        loading: false
+      });
+      this.loadExercises();
+    }).catch(() => {
+      this.setData({ loading: false });
+    });
+  },
+
+  loadExercises() {
+    this.setData({ loading: true });
+    const params = { page: this.data.page, pageSize: this.data.pageSize };
+    params[this.data.dimension] = this.data.activeValue;
+    svc.listExercises(params).then((res) => {
+      this.setData({
+        exercises: (res && res.items) || [],
+        total: (res && res.total) || 0,
+        loading: false
+      });
+    }).catch(() => {
+      this.setData({ loading: false });
+    });
+  },
+
+  onValue(e) {
+    const value = e.detail.value;
+    if (value === this.data.activeValue) return;
+    this.setData({ activeValue: value, page: 1 }, () => this.loadExercises());
+  },
+
+  onExercise(e) {
+    wx.navigateTo({ url: '/pages/detail/detail?id=' + encodeURIComponent(e.detail.id) });
+  }
+});

miniprogram/pages/category/category.json

@@ -0,0 +1,9 @@
+{
+  "navigationStyle": "custom",
+  "usingComponents": {
+    "navbar": "/components/navbar/index",
+    "chip": "/components/chip/index",
+    "exercise-card": "/components/exercise-card/index",
+    "bottom-nav": "/components/bottom-nav/index"
+  }
+}

miniprogram/pages/category/category.wxml

@@ -0,0 +1,29 @@
+<view class="page">
+  <navbar title="{{title}}" show-back />
+
+  <view class="section" style="padding-top: 8rpx;">
+    <scroll-view wx:if="{{values.length}}" scroll-x class="filterbar">
+      <chip
+        wx:for="{{values}}"
+        wx:key="value"
+        label="{{item.label}}"
+        value="{{item.value}}"
+        active="{{activeValue === item.value}}"
+        bind:tap="onValue" />
+      <view class="filterbar__spacer"></view>
+    </scroll-view>
+
+    <view class="count muted" wx:if="{{!loading}}">共 {{total}} 个动作</view>
+
+    <view class="grid" wx:if="{{exercises.length}}">
+      <view class="grid__item" wx:for="{{exercises}}" wx:key="id">
+        <exercise-card exercise="{{item}}" bind:tap="onExercise" />
+      </view>
+    </view>
+    <view wx:elif="{{!loading}}" class="empty">暂无数据</view>
+    <view wx:else class="empty">加载中…</view>
+  </view>
+
+  <view style="height: 160rpx;"></view>
+  <bottom-nav active="category" />
+</view>

miniprogram/pages/category/category.wxss

@@ -0,0 +1,8 @@
+.page { min-height: 100vh; background: var(--bg-grad); }
+.filterbar { white-space: nowrap; padding: 8rpx 0 4rpx; }
+.filterbar chip { display: inline-block; margin-right: 16rpx; }
+.filterbar__spacer { display: inline-block; width: 4rpx; }
+.count { font-size: 24rpx; margin: 20rpx 0 8rpx; }
+.grid { display: flex; flex-wrap: wrap; gap: 18rpx; margin-top: 12rpx; }
+.grid__item { width: calc((100% - 18rpx) / 2); }
+.empty { color: var(--text-3); font-size: 26rpx; text-align: center; padding: 80rpx 0; }