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)
+    });
+  }
+});