feat: 支持通过环境变量配置搜索接口限流参数

middleware/rate-limit.go

@@ -196,7 +196,10 @@ func userRedisRateLimiter(c *gin.Context, maxRequestNum int, duration int64, key
 }
 
 // SearchRateLimit returns a per-user rate limiter for search endpoints.
-// 10 requests per 60 seconds per user (by user ID, not IP).
+// Configurable via SEARCH_RATE_LIMIT_ENABLE / SEARCH_RATE_LIMIT / SEARCH_RATE_LIMIT_DURATION.
 func SearchRateLimit() func(c *gin.Context) {
+	if !common.SearchRateLimitEnable {
+		return defNext
+	}
 	return userRateLimitFactory(common.SearchRateLimitNum, common.SearchRateLimitDuration, "SR")
 }