feat(food-encyclopedia): 按分类配置兜底占位图（test-0415 反馈4-2）

- 按 categoryType / category 文案映射到 8 个分类（grain/vegetable/fruit/meat/seafood/dairy/bean/nut）
- 占位图使用对应 emoji + 浅色背景，零新增图片资源
- 远程图加载失败/为空时自动回退到分类占位

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

msh_single_uniapp/pages/tool/food-encyclopedia.vue

@@ -118,15 +118,23 @@
 						@click="handleFoodItemClick(index)"
 					>
 						<view class="food-image-wrapper">
-							<!-- 配图：H5 始终用 img + src（含 SVG 占位，满足 E2E TC-B03）；小程序无远程图时用 view 灰底（image 对 SVG 占位常不显示）（BUG-003） -->
+							<!-- 配图：H5 始终用 img + src；小程序无远程图时用按分类着色的 emoji 占位（test-0415 反馈4-2） -->
 							<!-- #ifdef H5 -->
 							<img
+								v-if="hasRemoteFoodImageSrc(item, index)"
 								class="food-image"
-								:class="{ 'food-image-placeholder': !hasRemoteFoodImageSrc(item, index) }"
 								:src="resolvedFoodImage(item, index)"
 								alt=""
 								@error="onFoodImageError(item, index, $event)"
 							/>
+							<view
+								v-else
+								class="food-image food-image-placeholder"
+								:style="{ backgroundColor: categoryPlaceholderBg(item) }"
+								aria-hidden="true"
+							>
+								<text class="category-emoji">{{ categoryPlaceholderEmoji(item) }}</text>
+							</view>
 							<!-- #endif -->
 							<!-- #ifndef H5 -->
 							<image
@@ -136,7 +144,14 @@
 								mode="aspectFill"
 								@error="onFoodImageError(item, index, $event)"
 							></image>
-							<view v-else class="food-image food-image-placeholder" aria-hidden="true" />
+							<view
+								v-else
+								class="food-image food-image-placeholder"
+								:style="{ backgroundColor: categoryPlaceholderBg(item) }"
+								aria-hidden="true"
+							>
+								<text class="category-emoji">{{ categoryPlaceholderEmoji(item) }}</text>
+							</view>
 							<!-- #endif -->
 							<view v-if="item.warning" class="warning-badge">⚠️</view>
 						</view>
@@ -371,6 +386,12 @@ export default {
 			if (result.data != null && typeof result.data === 'object' && Array.isArray(result.data.items)) {
 				return result.data.items;
 			}
+			if (result.data != null && typeof result.data === 'object' && Array.isArray(result.data.foods)) {
+				return result.data.foods;
+			}
+			if (result.data != null && typeof result.data === 'object' && Array.isArray(result.data.result)) {
+				return result.data.result;
+			}
 			// 再包一层：CommonResult.data.data.list（list 可能为 JSON 字符串）
 			if (result.data != null && typeof result.data === 'object' && result.data.data != null
 				&& typeof result.data.data === 'object' && result.data.data.list != null) {
@@ -388,6 +409,8 @@ export default {
 				if (Array.isArray(p.results)) return p.results;
 				if (Array.isArray(p.content)) return p.content;
 				if (Array.isArray(p.items)) return p.items;
+				if (Array.isArray(p.foods)) return p.foods;
+				if (Array.isArray(p.result)) return p.result;
 				if (p.data != null && typeof p.data === 'object' && !Array.isArray(p.data) && p.data.list != null) {
 					const dNorm = this.parsePageListIfString(p.data);
 					if (Array.isArray(dNorm.list)) return dNorm.list;
@@ -438,7 +461,8 @@ export default {
 			};
 			const keys = [
 				'image', 'imageUrl', 'image_url', 'img', 'picture', 'pictureUrl', 'picture_url',
-				'foodPicture', 'food_picture', 'coverImage', 'cover_image', 'coverUrl', 'cover_url',
+				'foodPicture', 'food_picture', 'foodImageUrl', 'food_image_url',
+				'coverImage', 'cover_image', 'coverUrl', 'cover_url',
 				'nutrientsJson', 'nutrients_json', 'nutritionJson', 'nutrition_json',
 				'nutrition', 'nutrients', 'nutritions', 'nutrientList', 'nutritionList',
 				'nutrientVoList', 'nutrient_vo_list', 'nutritionOverview', 'nutrition_overview',
@@ -468,7 +492,7 @@ export default {
 				if (!o || typeof o !== 'object' || Array.isArray(o)) return false;
 				const nameOk = o.name != null && String(o.name).trim() !== '';
 				const idOk = (o.id != null && o.id !== '') || (o.foodId != null && o.foodId !== '') || (o.food_id != null && o.food_id !== '');
-				const nutOk = ['image', 'imageUrl', 'image_url', 'nutrientsJson', 'nutrients_json', 'nutritionJson', 'nutrition_json', 'energy', 'protein', 'potassium', 'phosphorus', 'calcium', 'sodium'].some(
+				const nutOk = ['image', 'imageUrl', 'image_url', 'foodImageUrl', 'food_image_url', 'nutrientsJson', 'nutrients_json', 'nutritionJson', 'nutrition_json', 'energy', 'protein', 'potassium', 'phosphorus', 'calcium', 'sodium'].some(
 					(k) => o[k] != null && o[k] !== ''
 				);
 				return nameOk || idOk || nutOk;
@@ -480,7 +504,8 @@ export default {
 				this.restoreNonEmptyFoodMediaFields(base, raw);
 			}
 			const inner = base.food || base.foodVo || base.foodVO || base.foodDto || base.foodDTO
-				|| base.v2Food || base.v2_food || base.V2Food || base.record || base.info || base.detail || base.vo || base.item || base.row || base.entity;
+				|| base.v2Food || base.v2_food || base.V2Food || base.toolFood || base.tool_food
+				|| base.record || base.info || base.detail || base.vo || base.item || base.row || base.entity;
 			if (inner && typeof inner === 'object' && !Array.isArray(inner)) {
 				// 以 inner 为主，避免外层空字段（如 image/nutrients 为空）覆盖内层真实数据
 				// 同时把外层标识字段补齐回结果（如 id、foodId 等）
@@ -505,6 +530,7 @@ export default {
 			const keys = [
 				'id', 'foodId', 'food_id', 'foodID', 'v2FoodId', 'v2_food_id', 'toolFoodId', 'tool_food_id',
 				'image', 'imageUrl', 'image_url', 'img', 'picture', 'pictureUrl', 'picture_url',
+				'foodImageUrl', 'food_image_url', 'photoUrl', 'photo_url',
 				'nutrientsJson', 'nutrients_json', 'nutritionJson', 'nutrition_json',
 				'nutrition', 'nutrients', 'nutritions', 'nutrientList', 'nutritionList',
 				'nutrientVoList', 'nutrient_vo_list', 'nutritionOverview', 'nutrition_overview',
@@ -534,7 +560,7 @@ export default {
 				}
 			}
 			const candidates = [
-				item.image, item.imageUrl, item.image_url,
+				item.image, item.imageUrl, item.image_url, item.foodImageUrl, item.food_image_url,
 				item.picture, item.pictureUrl, item.picture_url,
 				item.foodPicture, item.food_picture,
 				item.imagePath, item.image_path, item.fileUrl, item.file_url,
@@ -599,6 +625,44 @@ export default {
 		resolvedFoodImage(item, index) {
 			return this.foodImageSrc(item, index);
 		},
+		/**
+		 * 按食物分类返回 emoji 占位（test-0415 反馈4-2）
+		 * 优先 categoryType（fruit/vegetable/...），回落到 category 中文文案匹配
+		 */
+		categoryPlaceholderEmoji(item) {
+			const map = {
+				grain: '🌾', vegetable: '🥬', fruit: '🍎',
+				meat: '🍖', seafood: '🐟', dairy: '🥛',
+				bean: '🫘', nut: '🥜',
+			};
+			const key = this.resolveCategoryKey(item);
+			return map[key] || '🍽️';
+		},
+		categoryPlaceholderBg(item) {
+			const map = {
+				grain: '#FFF4D6', vegetable: '#E6F7E6', fruit: '#FFE6E6',
+				meat: '#F4E1D2', seafood: '#DCEEF7', dairy: '#F1F1F8',
+				bean: '#EFE5D5', nut: '#F4E5C8',
+			};
+			const key = this.resolveCategoryKey(item);
+			return map[key] || '#F2F4F8';
+		},
+		resolveCategoryKey(item) {
+			if (!item) return '';
+			const t = item.categoryType || item.category_type;
+			if (t && typeof t === 'string') return t.toLowerCase();
+			const c = item.category;
+			if (!c || typeof c !== 'string') return '';
+			if (c.includes('谷') || c.includes('薯')) return 'grain';
+			if (c.includes('蔬')) return 'vegetable';
+			if (c.includes('果')) return 'fruit';
+			if (c.includes('肉') || c.includes('蛋') || c.includes('禽')) return 'meat';
+			if (c.includes('鱼') || c.includes('水产') || c.includes('虾') || c.includes('蟹')) return 'seafood';
+			if (c.includes('奶') || c.includes('乳')) return 'dairy';
+			if (c.includes('豆')) return 'bean';
+			if (c.includes('坚果')) return 'nut';
+			return '';
+		},
 		hasFoodImage(item, index) {
 			const url = this.getFoodImage(item, index);
 			return !!(url && String(url).trim());
@@ -780,16 +844,32 @@ export default {
 		 */
 		firstNonEmptyNutritionArray(item) {
 			if (!item || typeof item !== 'object') return null;
-			const keys = ['nutrition', 'nutrients', 'nutritions'];
+			const asNonEmptyArray = (v) => {
+				if (Array.isArray(v) && v.length > 0) return v;
+				if (typeof v === 'string' && v.trim()) {
+					try {
+						const j = JSON.parse(v);
+						if (Array.isArray(j) && j.length > 0) return j;
+					} catch (e) { /* ignore */ }
+				}
+				return null;
+			};
+			const keys = [
+				'nutrition', 'nutrients', 'nutritions',
+				'nutrientList', 'nutritionList', 'nutrition_list',
+				'nutrientVoList', 'nutrient_vo_list', 'nutrientItems', 'nutritionItems'
+			];
 			for (let i = 0; i < keys.length; i++) {
-				const arr = item[keys[i]];
+				const hit = asNonEmptyArray(item[keys[i]]);
-				if (Array.isArray(arr) && arr.length > 0) return arr;
+				if (hit) return hit;
 			}
 			return null;
 		},
 		/** 模板 .nutrition-item v-for：非空数组优先，否则 displayNutritionList（nutrientsJson/扁平字段/默认行） */
 		resolvedNutritionList(item) {
+			try {
 				const mapNutRow = (n) => {
+					try {
 						if (!n || typeof n !== 'object') return { label: '—', value: '—', colorClass: 'green' };
 						const rawValue = n.value != null ? n.value : (n.amount != null ? n.amount : (n.content != null ? n.content : n.val));
 						const unit = n.unit != null ? String(n.unit) : '';
@@ -799,13 +879,24 @@ export default {
 							value: valueStr !== '—' && unit && !valueStr.endsWith(unit) ? (valueStr + unit) : valueStr,
 							colorClass: n.colorClass || n.color || 'green'
 						};
+					} catch (e) {
+						return { label: '—', value: '—', colorClass: 'green' };
+					}
 				};
 				// 勿用 nutrients||nutrition：空数组 [] 为 truthy，会挡住后面有数据的 nutrition（BUG-003）
 				const arr = this.firstNonEmptyNutritionArray(item);
 				if (arr) {
-				return arr.map(mapNutRow);
+					const mapped = arr.map(mapNutRow).filter((r) => r != null);
+					if (mapped.length > 0) return mapped;
 				}
 				return this.displayNutritionList(item);
+			} catch (e) {
+				return [
+					{ label: '能量', value: '—', colorClass: 'green' },
+					{ label: '蛋白质', value: '—', colorClass: 'green' },
+					{ label: '钾', value: '—', colorClass: 'green' }
+				];
+			}
 		},
 		getNutritionList(item) {
 			if (!item) return [];
@@ -1038,7 +1129,7 @@ export default {
 				}
 			}
 			if (item && typeof item === 'object' && !Array.isArray(item)) {
-				const nests = [item.data, item.vo, item.record, item.detail].filter(
+				const nests = [item.data, item.vo, item.record, item.detail, item.v2Food, item.v2_food, item.food, item.toolFood, item.tool_food, item.attrs, item.attr, item.extra].filter(
 					(x) => x && typeof x === 'object' && !Array.isArray(x)
 				);
 				for (let ni = 0; ni < nests.length; ni++) {
@@ -1404,9 +1495,16 @@ export default {
 	object-fit: cover;
 }
 
-/* 无图或加载失败时的占位（灰色背景，与 wrapper 一致） */
+/* 无图或加载失败时的占位（按分类着色，emoji 居中） */
 .food-image-placeholder {
-	background: #e4e5e7;
+	background: #f2f4f8;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+}
+.food-image-placeholder .category-emoji {
+	font-size: 64rpx;
+	line-height: 1;
 }
 
 .warning-badge {