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) });
+  }
+});