server: Go 服务器（REST+WSS 网关+JWT+Argon2+配对+素材直链+任务状态机）；修复并发下线 send-on-closed-channel、下发查询 SQL 优先级、配对码原子占用、上传体积上限、JWT 默认密钥告警

server/internal/cache/cache.go

@@ -0,0 +1,31 @@
+package cache
+
+import (
+	"context"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+
+	"everypublish/server/internal/config"
+)
+
+// Redis 封装（D4 起 asynq 队列同源共用）
+type Redis struct {
+	client *redis.Client
+}
+
+// New 建立 Redis 连接
+func New(cfg *config.Config) *Redis {
+	client := redis.NewClient(&redis.Options{Addr: cfg.RedisAddr, Password: cfg.RedisPass, DB: 0})
+	return &Redis{client: client}
+}
+
+// Ping 探测
+func (r *Redis) Ping() error {
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+	return r.client.Ping(ctx).Err()
+}
+
+// Client 暴露底层客户端
+func (r *Redis) Client() *redis.Client { return r.client }