fix: 添加缓存表定时清理任务，修复 cache_link_info 无限增长

- CacheManager 添加 cleanupExpiredCache() 方法删除过期缓存记录
- PostExecVerticle 注册每小时执行一次的定时清理任务
- 原实现只有读时惰性检查过期，过期记录永远不会被删除，长期运行后数据库持续膨胀

core/src/main/java/cn/qaiu/vx/core/verticle/PostExecVerticle.java

@@ -46,7 +46,7 @@ public class PostExecVerticle extends AbstractVerticle {
             return;
         }
         LOGGER.info("PostExecVerticle 开始执行...");
-        
+
         if (appRunImplementations != null && !appRunImplementations.isEmpty()) {
             appRunImplementations.forEach(appRun -> {
                 try {
@@ -61,7 +61,17 @@ public class PostExecVerticle extends AbstractVerticle {
         } else {
             LOGGER.info("未找到 AppRun 接口的实现类");
         }
-        
+
+        // 注册定时清理过期缓存任务（每小时执行一次）
+        vertx.setPeriodic(3600_000, 3600_000, id -> {
+            try {
+                cn.qaiu.lz.common.cache.CacheManager cacheManager = new cn.qaiu.lz.common.cache.CacheManager();
+                cacheManager.cleanupExpiredCache();
+            } catch (Exception e) {
+                LOGGER.debug("定时清理缓存任务跳过（数据库可能未就绪）", e);
+            }
+        });
+
         LOGGER.info("PostExecVerticle 执行完成");
         startPromise.complete();
     }

web-service/src/main/java/cn/qaiu/lz/common/cache/CacheManager.java

@@ -200,6 +200,31 @@ public class CacheManager {
         return promise.future();
     }
 
+    /**
+     * 清理过期缓存记录，防止数据库无限增长
+     * @return 删除的行数
+     */
+    public Future<Integer> cleanupExpiredCache() {
+        String sql = "DELETE FROM cache_link_info WHERE expiration > 0 AND expiration < #{now}";
+        Map<String, Object> params = new HashMap<>();
+        params.put("now", System.currentTimeMillis());
+        Promise<Integer> promise = Promise.promise();
+        SqlTemplate.forUpdate(jdbcPool, sql)
+                .execute(params)
+                .onSuccess(res -> {
+                    int deleted = res.rowCount();
+                    if (deleted > 0) {
+                        LOGGER.info("清理过期缓存记录 {} 条", deleted);
+                    }
+                    promise.complete(deleted);
+                })
+                .onFailure(e -> {
+                    LOGGER.error("清理过期缓存失败", e);
+                    promise.fail(e);
+                });
+        return promise.future();
+    }
+
     public Future<Map<String, Integer>> getShareKeyTotal(String shareKey) {
         String sql = """
                 SELECT `share_key`, SUM(cache_hit_total) AS hit_total, SUM(api_parser_total) AS parser_total