🔄Update: 布隆过滤器启动时加载历史点赞数据

解决缓存穿透防护的历史数据缺失问题：
- 启动时从 DB 加载所有已有点赞记录到布隆过滤器
- 仅查询 userid 和 blogId 两个字段，减少内存开销
- 确保布隆过滤器的'false=一定不存在'语义正确

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

src/main/java/cn/hezhaohui/thumb/manager/cache/BloomFilterManager.java

@@ -1,8 +1,12 @@
 package cn.hezhaohui.thumb.manager.cache;
 
+import cn.hezhaohui.thumb.mapper.ThumbMapper;
+import cn.hezhaohui.thumb.model.entity.Thumb;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.google.common.hash.BloomFilter;
 import com.google.common.hash.Funnels;
 import jakarta.annotation.PostConstruct;
+import jakarta.annotation.Resource;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Component;
 
@@ -35,6 +39,9 @@ public class BloomFilterManager {
      */
     private static double FPP = 0.01;
 
+    @Resource
+    private ThumbMapper thumbMapper;
+
     @PostConstruct
     public void init() {
         thumbBloomFilter = BloomFilter.create(
@@ -42,6 +49,12 @@ public class BloomFilterManager {
                 EXPECTED_INSERTIONS,
                 FPP
         );
+        // 从数据库加载所有历史点赞记录到布隆过滤器
+        LambdaQueryWrapper<Thumb> queryWrapper = new LambdaQueryWrapper<>();
+        queryWrapper.select(Thumb::getUserid, Thumb::getBlogId);
+        thumbMapper.selectList(queryWrapper).forEach(thumb ->
+                thumbBloomFilter.put(buildKey(thumb.getUserid(), thumb.getBlogId()))
+        );
         log.info("布隆过滤器初始化完成，预期插入量: {}, 误判率: {}", EXPECTED_INSERTIONS, FPP);
     }