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/collection/collection.js

@@ -0,0 +1,40 @@
+const app = getApp();
+const svc = require('../../services/exercise');
+
+Page({
+  data: {
+    statusBarHeight: 20,
+    collections: [],
+    counts: {},
+    loading: true
+  },
+
+  onLoad() {
+    this.setData({ statusBarHeight: app.globalData.statusBarHeight || 20 });
+    this.load();
+  },
+
+  load() {
+    this.setData({ loading: true });
+    svc.listCollections().then((list) => {
+      const collections = list || [];
+      this.setData({ collections, loading: false });
+      // 异步获取每个训练组合的动作数量
+      collections.forEach(c => {
+        svc.getCollectionExercises(c.slug, { pageSize: 1 }).then((res) => {
+          const key = 'counts.' + c.slug;
+          this.setData({ [key]: (res && res.total) || 0 });
+        }).catch(() => {});
+      });
+    }).catch(() => {
+      this.setData({ loading: false });
+    });
+  },
+
+  onOpen(e) {
+    wx.navigateTo({
+      url: '/pages/collection-detail/collection-detail?slug=' +
+        encodeURIComponent(e.currentTarget.dataset.slug)
+    });
+  }
+});

miniprogram/pages/collection/collection.json

@@ -0,0 +1,7 @@
+{
+  "navigationStyle": "custom",
+  "usingComponents": {
+    "navbar": "/components/navbar/index",
+    "bottom-nav": "/components/bottom-nav/index"
+  }
+}

miniprogram/pages/collection/collection.wxml

@@ -0,0 +1,31 @@
+<view class="page">
+  <navbar title="训练计划" />
+  <view class="section" style="padding-top: 8rpx;">
+    <view class="intro">
+      <view class="intro__eyebrow">PROGRAMS</view>
+      <view class="intro__title">挑选你的训练主题</view>
+      <view class="intro__sub">从推、拉、腿到居家无器械，一键开启</view>
+    </view>
+
+    <view class="list" wx:if="{{collections.length}}">
+      <view
+        wx:for="{{collections}}"
+        wx:key="slug"
+        class="col-card"
+        style="background: linear-gradient(135deg, {{item.color}}26, var(--surface)); border-color: {{item.color}}55;"
+        data-slug="{{item.slug}}"
+        bindtap="onOpen">
+        <view class="col-card__emoji" style="background: {{item.color}}22;">{{item.emoji}}</view>
+        <view class="col-card__main">
+          <view class="col-card__name">{{item.name}}</view>
+          <view class="col-card__desc">{{item.description}}</view>
+        </view>
+        <view class="col-card__count" style="color: {{item.color}};">{{counts[item.slug] || ''}} 个动作 ›</view>
+      </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="plan" />
+</view>

miniprogram/pages/collection/collection.wxss

@@ -0,0 +1,22 @@
+.page { min-height: 100vh; background: var(--bg-grad); }
+.intro { padding: 16rpx 0 28rpx; }
+.intro__eyebrow { color: var(--gold); font-size: 22rpx; letter-spacing: 4rpx; }
+.intro__title { font-size: 44rpx; font-weight: 700; margin-top: 12rpx; }
+.intro__sub { font-size: 26rpx; color: var(--text-2); margin-top: 12rpx; }
+
+.list { display: flex; flex-direction: column; gap: 20rpx; }
+.col-card {
+  display: flex; align-items: center; gap: 24rpx;
+  background: var(--surface); border: 1rpx solid var(--line);
+  border-radius: var(--radius); padding: 28rpx;
+}
+.col-card__emoji {
+  width: 96rpx; height: 96rpx; border-radius: 24rpx;
+  display: flex; align-items: center; justify-content: center;
+  font-size: 52rpx; flex: 0 0 auto;
+}
+.col-card__main { flex: 1; min-width: 0; }
+.col-card__name { font-size: 34rpx; font-weight: 700; color: var(--text); }
+.col-card__desc { font-size: 24rpx; color: var(--text-2); margin-top: 8rpx; line-height: 1.4; }
+.col-card__count { font-size: 24rpx; flex: 0 0 auto; }
+.empty { color: var(--text-3); font-size: 26rpx; text-align: center; padding: 80rpx 0; }