compat(redis): replicate effects for Lua scripts using TIME on Redis 3.2-4.x

Call redis.replicate_commands() at the top of every Lua script that
reads redis.call('TIME'), so the resulting writes (ZADD, ZREMRANGEBYSCORE,
SET, DEL, EXPIRE) replicate correctly on Redis 3.2-4.x.

This is a no-op on Redis 5.0+, where effects replication is the default.
The function remains a public API on Redis 7.0+ (deprecated but supported)
and is still the documented way to opt into effects replication on older
versions, so calling it unconditionally is safe and forward-compatible.

Affected scripts (8 in total, all already using redis.call('TIME') by
design to avoid client-side clock skew across multiple app instances):
- concurrency_cache.go: acquireScript, getCountScript,
  cleanupExpiredSlotsScript
- session_limit_cache.go: registerSessionScript, refreshSessionScript,
  getActiveSessionCountScript, isSessionActiveScript
- user_msg_queue_cache.go: releaseLockScript

Scripts that do not invoke non-deterministic commands are intentionally
left untouched.

backend/internal/repository/concurrency_cache.go

@@ -44,6 +44,9 @@ var (
 	// ARGV[2] = TTL（秒）
 	// ARGV[3] = requestID
 	acquireScript = redis.NewScript(`
+		-- Redis 3.2-4.x compat: opt into effects replication so redis.call('TIME')
+		-- replicates correctly. No-op on Redis 5.0+ (effects replication is default).
+		redis.replicate_commands()
 		local key = KEYS[1]
 		local maxConcurrency = tonumber(ARGV[1])
 		local ttl = tonumber(ARGV[2])
@@ -81,6 +84,9 @@ var (
 	// KEYS[1] = 有序集合键
 	// ARGV[1] = TTL（秒）
 	getCountScript = redis.NewScript(`
+		-- Redis 3.2-4.x compat: opt into effects replication so redis.call('TIME')
+		-- replicates correctly. No-op on Redis 5.0+ (effects replication is default).
+		redis.replicate_commands()
 		local key = KEYS[1]
 		local ttl = tonumber(ARGV[1])
 
@@ -151,6 +157,9 @@ var (
 	// KEYS[1] = 有序集合键
 	// ARGV[1] = TTL（秒）
 	cleanupExpiredSlotsScript = redis.NewScript(`
+		-- Redis 3.2-4.x compat: opt into effects replication so redis.call('TIME')
+		-- replicates correctly. No-op on Redis 5.0+ (effects replication is default).
+		redis.replicate_commands()
 		local key = KEYS[1]
 		local ttl = tonumber(ARGV[1])
 		local timeResult = redis.call('TIME')

backend/internal/repository/session_limit_cache.go

@@ -42,6 +42,9 @@ var (
 	// ARGV[3] = sessionUUID
 	// 返回: 1 = 允许, 0 = 拒绝
 	registerSessionScript = redis.NewScript(`
+		-- Redis 3.2-4.x compat: opt into effects replication so redis.call('TIME')
+		-- replicates correctly. No-op on Redis 5.0+ (effects replication is default).
+		redis.replicate_commands()
 		local key = KEYS[1]
 		local maxSessions = tonumber(ARGV[1])
 		local idleTimeout = tonumber(ARGV[2])
@@ -82,6 +85,9 @@ var (
 	// ARGV[1] = idleTimeout（秒）
 	// ARGV[2] = sessionUUID
 	refreshSessionScript = redis.NewScript(`
+		-- Redis 3.2-4.x compat: opt into effects replication so redis.call('TIME')
+		-- replicates correctly. No-op on Redis 5.0+ (effects replication is default).
+		redis.replicate_commands()
 		local key = KEYS[1]
 		local idleTimeout = tonumber(ARGV[1])
 		local sessionUUID = ARGV[2]
@@ -102,6 +108,9 @@ var (
 	// KEYS[1] = session_limit:account:{accountID}
 	// ARGV[1] = idleTimeout（秒）
 	getActiveSessionCountScript = redis.NewScript(`
+		-- Redis 3.2-4.x compat: opt into effects replication so redis.call('TIME')
+		-- replicates correctly. No-op on Redis 5.0+ (effects replication is default).
+		redis.replicate_commands()
 		local key = KEYS[1]
 		local idleTimeout = tonumber(ARGV[1])
 
@@ -120,6 +129,9 @@ var (
 	// ARGV[1] = idleTimeout（秒）
 	// ARGV[2] = sessionUUID
 	isSessionActiveScript = redis.NewScript(`
+		-- Redis 3.2-4.x compat: opt into effects replication so redis.call('TIME')
+		-- replicates correctly. No-op on Redis 5.0+ (effects replication is default).
+		redis.replicate_commands()
 		local key = KEYS[1]
 		local idleTimeout = tonumber(ARGV[1])
 		local sessionUUID = ARGV[2]

backend/internal/repository/user_msg_queue_cache.go

@@ -34,6 +34,9 @@ return 1
 
 // Lua 脚本：原子释放锁 + 记录完成时间（使用 Redis TIME 避免时钟偏差）
 var releaseLockScript = redis.NewScript(`
+-- Redis 3.2-4.x compat: opt into effects replication so redis.call('TIME')
+-- replicates correctly. No-op on Redis 5.0+ (effects replication is default).
+redis.replicate_commands()
 local cur = redis.call('GET', KEYS[1])
 if cur == ARGV[1] then
     redis.call('DEL', KEYS[1])