fix: 修复手动测试发现的3项问题

1. food-encyclopedia: 修复 v-for key id:index TypeError
   - :key 改为 :key="index"，避免 WeChat 小程序 key 表达式异常
   - filteredFoodList 加本地搜索过滤 + null item 过滤
   - normalizeFoodItem 新增英文→中文分类名映射（grain→谷薯类等）
   - loadFoodList/handleSearch 过滤 null 条目

2. ToolKnowledgeServiceImpl: 修复 TooManyResultsException
   - getNutrientDetail 查询新增 LIMIT 1 + ORDER BY knowledge_id DESC
   - 防止 DB 中同名营养素存在多条导致 selectOne 异常

3. ai-nutritionist: 统一走 Coze API，移除 KieAI Gemini 路径
   - sendToAI 文本/多模态均改为 api.cozeChat + pollChatStatus
   - 支持 type='text'/'multimodal'/图片 三种消息类型构建

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

msh_single_uniapp/pages/tool/food-encyclopedia.vue

@@ -96,10 +96,10 @@
 			<view class="food-list-container">
 				<view class="food-count">共 {{ filteredFoodList.length }} 种食物</view>
 				<view class="food-list">
-					<view 
-						class="food-item" 
-						v-for="(item, index) in filteredFoodList" 
-						:key="item.id != null ? item.id : index"
+					<view
+						class="food-item"
+						v-for="(item, index) in filteredFoodList"
+						:key="index"
 						@click="goToFoodDetail(item)"
 					>
 						<view class="food-image-wrapper">
@@ -244,7 +244,10 @@ export default {
 	},
 	computed: {
 		filteredFoodList() {
-			return this.foodList
+			const list = (this.foodList || []).filter(item => item != null);
+			if (!this.searchText || !this.searchText.trim()) return list;
+			const kw = this.searchText.trim().toLowerCase();
+			return list.filter(item => item.name && item.name.toLowerCase().includes(kw));
 		},
 	},
 	onLoad(options) {
@@ -264,7 +267,7 @@ export default {
 				});
 				const rawList = this.getRawFoodList(result);
 				this.imageErrorIds = {};
-				this.foodList = (rawList || []).map(item => this.normalizeFoodItem(item));
+				this.foodList = (rawList || []).map(item => this.normalizeFoodItem(item)).filter(i => i != null);
 			} catch (error) {
 				console.error('加载食物列表失败:', error);
 			}
@@ -319,6 +322,13 @@ export default {
 			}
 		},
 		normalizeFoodItem(item) {
+			if (!item) return null;
+			// 英文分类 key → 中文显示名称
+			const categoryNameMap = {
+				grain: '谷薯类', vegetable: '蔬菜类', fruit: '水果类',
+				meat: '肉蛋类', seafood: '水产类', dairy: '奶类',
+				bean: '豆类', nut: '坚果类', all: '全部'
+			};
 			const safetyMap = {
 				suitable: { safety: '放心吃', safetyClass: 'safe' },
 				moderate: { safety: '限量吃', safetyClass: 'limited' },
@@ -368,12 +378,16 @@ export default {
 				? (typeof rawId === 'number' ? rawId : Number(rawId))
 				: undefined;
 			// 保证列表项必有 image/imageUrl（空时由 getFoodImage 用 defaultPlaceholder）和 nutrition 数组（.nutrition-item 数据来源）
+			// 将英文分类名映射为中文，若已是中文则保留
+			const rawCategory = item.category || item.categoryName || item.category_name || '';
+			const category = categoryNameMap[rawCategory] || rawCategory;
+
 			return {
 				...item,
 				id: numericId,
 				image: image || '',
 				imageUrl: image || '',
-				category: item.category || '',
+				category,
 				safety: safety.safety,
 				safetyClass: safety.safetyClass,
 				nutrition: Array.isArray(nutrition) ? nutrition : []
@@ -404,7 +418,7 @@ export default {
 						});
 						const rawList = this.getRawFoodList(result);
 						this.imageErrorIds = {};
-						this.foodList = (rawList || []).map(item => this.normalizeFoodItem(item));
+						this.foodList = (rawList || []).map(item => this.normalizeFoodItem(item)).filter(i => i != null);
 					} catch (error) {
 						console.error('搜索失败:', error);
 					}