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.wxml

@@ -0,0 +1,80 @@
+<view class="page" style="padding-top: {{statusBarHeight}}px;">
+  <view class="topbar">
+    <view class="topbar__back" bindtap="onBack">‹</view>
+    <view class="topbar__title">智能推荐</view>
+  </view>
+
+  <!-- 步骤 1：选择目标肌群 -->
+  <block wx:if="{{step === 1}}">
+    <view class="hero2">
+      <view class="hero2__eyebrow">SMART MATCH</view>
+      <view class="hero2__title">选择你的目标肌群</view>
+      <view class="hero2__sub">为你智能匹配最合适动作，并给出训练理由</view>
+    </view>
+
+    <view class="section">
+      <view class="group" wx:for="{{bodyGroups}}" wx:key="label" wx:for-item="group">
+        <view class="group__label eyebrow">{{group.label}}</view>
+        <view class="group__chips">
+          <view
+            wx:for="{{group.targets}}"
+            wx:key="value"
+            wx:for-item="t"
+            class="tgt {{selectedTarget === t.value ? 'tgt--active' : ''}}"
+            data-value="{{t.value}}"
+            data-label="{{t.label}}"
+            bindtap="onSelectTarget">
+            <text>{{t.label}}</text>
+            <text class="tgt__count">{{t.count}}</text>
+          </view>
+        </view>
+      </view>
+
+      <view class="group" wx:if="{{equipments.length}}">
+        <view class="group__label eyebrow">器械偏好（可选）</view>
+        <view class="group__chips">
+          <view
+            wx:for="{{equipments}}"
+            wx:key="value"
+            wx:for-item="eq"
+            class="tgt {{selectedEquipment === eq.value ? 'tgt--active' : ''}}"
+            data-value="{{eq.value}}"
+            bindtap="onSelectEquipment">
+            <text>{{eq.label}}</text>
+          </view>
+        </view>
+      </view>
+    </view>
+
+    <view class="confirm">
+      <view class="confirm__bar">
+        <text wx:if="{{selectedTargetLabel}}" class="confirm__sel">已选：{{selectedTargetLabel}}</text>
+        <text wx:else class="confirm__hint">请选择目标肌群</text>
+      </view>
+      <view class="cta" bindtap="onConfirm">
+        <text>智能匹配动作</text>
+        <text class="cta__arrow">›</text>
+      </view>
+    </view>
+  </block>
+
+  <!-- 步骤 2：结果列表 -->
+  <block wx:else>
+    <view class="section" style="padding-top: 8rpx;">
+      <view class="result-head">
+        <text class="result-head__title">为你匹配 · {{selectedTargetLabel}}</text>
+        <text class="result-head__count">{{results.length}} 个动作</text>
+      </view>
+      <view class="rlist" wx:if="{{results.length}}">
+        <view class="rlist__item" wx:for="{{results}}" wx:key="id" wx:for-item="item">
+          <exercise-card
+            exercise="{{item}}"
+            score="{{item.score}}"
+            reason="{{item.reason}}"
+            bind:tap="onExercise" />
+        </view>
+      </view>
+      <view wx:else class="empty">{{ loading ? '匹配中…' : '暂无匹配结果' }}</view>
+    </view>
+  </block>
+</view>