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/components/exercise-card/index.js

@@ -0,0 +1,14 @@
+Component({
+  properties: {
+    exercise: { type: Object, value: {} },
+    score: { type: Number, value: 0 },
+    reason: { type: String, value: '' },
+    compact: { type: Boolean, value: false }
+  },
+  methods: {
+    onTap() {
+      const ex = this.data.exercise || {};
+      this.triggerEvent('tap', { id: ex.id, exercise: ex });
+    }
+  }
+});