feat: 改进标签系统 — 新增品类/费用/强度/预约标签，timeSlot 参与选活动

- IdeaCategory 扩展 7→9，新增 experience（体验）和 nature（自然）
- 替换 outdoor boolean 为 costLevel/intensity/needsBooking 三个高价值字段
- AI 标注 prompt 同步更新，行程规划新增强度交替、费用平衡、预约提醒原则
- selectIdeasForSlots 重写为四优先级：timeSlot+category > category > timeSlot > 任意
- 前端想法卡片展示费用/强度/预约标签

src/app/blindbox/[code]/page.tsx

@@ -448,7 +448,9 @@ export default function BlindboxRoomPage() {
           category: data.tags.category,
           timeSlot: data.tags.timeSlot,
           estimatedMinutes: data.tags.estimatedMinutes,
-          outdoor: data.tags.outdoor,
+          costLevel: data.tags.costLevel,
+          intensity: data.tags.intensity,
+          needsBooking: data.tags.needsBooking,
           searchQuery: data.tags.searchQuery,
           searchType: data.tags.searchType,
         },
@@ -490,7 +492,9 @@ export default function BlindboxRoomPage() {
           category: data.tags.category,
           timeSlot: data.tags.timeSlot,
           estimatedMinutes: data.tags.estimatedMinutes,
-          outdoor: data.tags.outdoor,
+          costLevel: data.tags.costLevel,
+          intensity: data.tags.intensity,
+          needsBooking: data.tags.needsBooking,
           searchQuery: data.tags.searchQuery,
           searchType: data.tags.searchType,
         },