feat: 百科rag

pages/wiki/detail/index.js

@@ -142,5 +142,12 @@ Page({
             title: `植物百科 - ${this.data.plant.name}`,
             path: `/pages/wiki/detail/index?id=${this.data.plant.id}`
         };
+    },
+
+    askAiAboutPlant() {
+        const name = this.data.plant ? this.data.plant.name : '';
+        wx.navigateTo({
+            url: `/pages/wiki/chat/index?prefillQuestion=${encodeURIComponent(name + '怎么养护？')}`
+        });
     }
 });

pages/wiki/detail/index.wxml

@@ -195,9 +195,14 @@
       </view>
     </view>
 
-    <view style="height: 40rpx;"></view>
+    <view style="height: 120rpx;"></view>
   </scroll-view>
 
+  <!-- Ask AI FAB -->
+  <view class="ask-ai-fab" bindtap="askAiAboutPlant">
+    <text class="fab-emoji">🤖</text>
+    <text>问 AI</text>
+  </view>
 
 </view>
 

pages/wiki/detail/index.wxss

@@ -286,3 +286,27 @@ page {
   transform: scale(0.9);
   transition: transform 0.1s;
 }
+
+/* Ask AI FAB */
+.ask-ai-fab {
+  position: fixed;
+  right: 32rpx;
+  bottom: 48rpx;
+  background: linear-gradient(135deg, rgba(21,101,192,0.92), rgba(25,118,210,0.92));
+  backdrop-filter: blur(12px);
+  color: #fff;
+  padding: 20rpx 32rpx;
+  border-radius: 48rpx;
+  display: flex;
+  align-items: center;
+  gap: 10rpx;
+  font-size: 26rpx;
+  font-weight: 700;
+  box-shadow: 0 8rpx 28rpx rgba(21,101,192,0.3);
+  z-index: 100;
+  transition: all 0.2s;
+}
+
+.ask-ai-fab:active { transform: scale(0.92); }
+
+.fab-emoji { font-size: 32rpx; line-height: 1; }