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/utils/request.js

@@ -0,0 +1,31 @@
+// 统一的网络请求封装：所有请求都经过此包装器。
+// 后端为公开 API，无需鉴权头；失败时统一 toast 提示。
+const { BASE_URL } = require('../config');
+
+function request({ url, method = 'GET', data = {} }) {
+  return new Promise((resolve, reject) => {
+    wx.request({
+      url: BASE_URL + url,
+      method,
+      data,
+      header: { 'content-type': 'application/json' },
+      success(res) {
+        if (res.statusCode >= 200 && res.statusCode < 300) {
+          resolve(res.data);
+        } else {
+          wx.showToast({
+            title: '请求失败 (' + res.statusCode + ')',
+            icon: 'none'
+          });
+          reject(res);
+        }
+      },
+      fail(err) {
+        wx.showToast({ title: '网络错误，请稍后重试', icon: 'none' });
+        reject(err);
+      }
+    });
+  });
+}
+
+module.exports = { request };