feat: AI 周末行程规划 — DeepSeek 智能排期 + 高德 POI + 多日翻页

- 接入 DeepSeek API，提交想法时自动 AI 打标（品类/时段/时长/搜索策略）
- 新增行程规划 API：智能选取想法 → 高德 POI 搜索 → AI 生成最优行程
- 支持多日计划（"整个周末"拆分周六/周日，并行 AI 调用）
- 行程展示逐日翻页，时间线可滚动，操作按钮固定底部
- 分享卡适配多日格式，支持图片保存与原生分享
- Prisma schema 新增 WeekendPlan 模型及 BlindBoxIdea AI 标签字段
- Jenkinsfile 集成 DEEPSEEK_API_KEY 环境变量

package-lock.json

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