feat: 添加项目置顶功能

在仪表盘中添加置顶项目功能，包括：
- 新增置顶项目展示区域
- 为AI推荐项目添加置顶/取消置顶操作
- 后端接口支持置顶状态管理

src/bids/controllers/bid.controller.ts

@@ -1,4 +1,4 @@
-import { Controller, Get, Query } from '@nestjs/common';
+import { Controller, Get, Query, Patch, Param, Body } from '@nestjs/common';
 import { BidsService } from '../services/bid.service';
 
 @Controller('api/bids')
@@ -15,6 +15,11 @@ export class BidsController {
     return this.bidsService.getRecentBids();
   }
 
+  @Get('pinned')
+  getPinned() {
+    return this.bidsService.getPinnedBids();
+  }
+
   @Get('sources')
   getSources() {
     return this.bidsService.getSources();
@@ -30,4 +35,9 @@ export class BidsController {
   getCrawlInfoStats() {
     return this.bidsService.getCrawlInfoAddStats();
   }
+
+  @Patch(':title/pin')
+  updatePin(@Param('title') title: string, @Body() body: { pin: boolean }) {
+    return this.bidsService.updatePin(title, body.pin);
+  }
 }

src/bids/entities/bid-item.entity.ts

@@ -17,6 +17,9 @@ export class BidItem {
   @Column()
   source: string;
 
+  @Column({ default: false })
+  pin: boolean;
+
   @CreateDateColumn()
   createdAt: Date;
 

src/bids/services/bid.service.ts

@@ -73,6 +73,14 @@ export class BidsService {
       .getMany();
   }
 
+  async getPinnedBids() {
+    return this.bidRepository
+      .createQueryBuilder('bid')
+      .where('bid.pin = :pin', { pin: true })
+      .orderBy('bid.publishDate', 'DESC')
+      .getMany();
+  }
+
   async getBidsByDateRange(startDate?: string, endDate?: string, keywords?: string[]) {
     const qb = this.bidRepository.createQueryBuilder('bid');
 
@@ -101,6 +109,15 @@ export class BidsService {
     return qb.orderBy('bid.publishDate', 'DESC').getMany();
   }
 
+  async updatePin(title: string, pin: boolean) {
+    const item = await this.bidRepository.findOne({ where: { title } });
+    if (!item) {
+      throw new Error('Bid not found');
+    }
+    item.pin = pin;
+    return this.bidRepository.save(item);
+  }
+
   async getCrawlInfoAddStats() {
     // 获取每个来源的最新一次爬虫记录（按 createdAt 降序）
     const query = `