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/recommend/recommend.js

@@ -0,0 +1,91 @@
+const app = getApp();
+const svc = require('../../services/exercise');
+
+Page({
+  data: {
+    statusBarHeight: 20,
+    step: 1, // 1: 选择目标肌群 / 2: 展示结果
+    bodyGroups: [],
+    selectedTarget: '',
+    selectedTargetLabel: '',
+    equipments: [],
+    selectedEquipment: '',
+    results: [],
+    loading: false
+  },
+
+  onLoad() {
+    this.setData({ statusBarHeight: app.globalData.statusBarHeight || 20 });
+    this.prepare();
+  },
+
+  prepare() {
+    this.setData({ loading: true });
+    Promise.all([
+      svc.getCategories('targets').catch(() => []),
+      svc.getCategories('equipment').catch(() => []),
+      svc.getCategories('body-parts').catch(() => [])
+    ]).then(([targets, equipments, bodyParts]) => {
+      const tList = targets || [];
+      // 按 bodyPart 将目标肌群分组展示；后端未返回分组字段时退化为单组
+      const grouped = {};
+      (bodyParts || []).forEach(bp => { grouped[bp.value] = { label: bp.label, targets: [] }; });
+      tList.forEach(t => {
+        const key = t.bodyPart || 'other';
+        if (!grouped[key]) grouped[key] = { label: t.bodyPartLabel || '其他', targets: [] };
+        grouped[key].targets.push(t);
+      });
+      const bodyGroups = Object.keys(grouped)
+        .map(k => grouped[k])
+        .filter(g => g.targets.length);
+      this.setData({
+        bodyGroups: bodyGroups.length ? bodyGroups : [{ label: '全部目标肌群', targets: tList }],
+        equipments: equipments || [],
+        loading: false
+      });
+    }).catch(() => {
+      this.setData({ loading: false });
+    });
+  },
+
+  onSelectTarget(e) {
+    this.setData({
+      selectedTarget: e.currentTarget.dataset.value,
+      selectedTargetLabel: e.currentTarget.dataset.label
+    });
+  },
+
+  onSelectEquipment(e) {
+    const value = e.currentTarget.dataset.value;
+    this.setData({ selectedEquipment: this.data.selectedEquipment === value ? '' : value });
+  },
+
+  onConfirm() {
+    if (!this.data.selectedTarget) {
+      wx.showToast({ title: '请先选择目标肌群', icon: 'none' });
+      return;
+    }
+    this.setData({ loading: true, step: 2 });
+    svc.recommend({
+      target: this.data.selectedTarget,
+      equipment: this.data.selectedEquipment,
+      limit: 20
+    }).then((res) => {
+      this.setData({ results: (res && res.items) || [], loading: false });
+    }).catch(() => {
+      this.setData({ loading: false });
+    });
+  },
+
+  onBack() {
+    if (this.data.step === 2) {
+      this.setData({ step: 1 });
+    } else {
+      wx.navigateBack();
+    }
+  },
+
+  onExercise(e) {
+    wx.navigateTo({ url: '/pages/detail/detail?id=' + encodeURIComponent(e.detail.id) });
+  }
+});