chore: 删除 ratelimit_middleware.go.tmp 临时文件

与 ratelimit_middleware.go 内容完全重复(SHA256 一致,1116 字节),
且无任何代码引用 .tmp 路径,属于误提交的开发期残留文件。

middleware/ratelimit_middleware.go.tmp

@@ -1,32 +0,0 @@
-package middleware
-
-import (
-	"log"
-	"net/http"
-)
-
-func RateLimit(next http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		clientIP := GetClientIP(r)
-		if !GlobalRateLimiter.Allow(clientIP) {
-			log.Printf("警告: 已超过IP速率限制，拒绝请求 - 客户端IP: %s", clientIP)
-			SendJSONError(w, http.StatusTooManyRequests, "Rate limit exceeded. Please try again later.", "rate_limit_error", "rate_limit_exceeded")
-			return
-		}
-		next.ServeHTTP(w, r)
-	})
-}
-
-func ConcurrencyLimit(next http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		select {
-		case ConcurrencySem <- struct{}{}:
-			defer func() { <-ConcurrencySem }()
-			next.ServeHTTP(w, r)
-		default:
-			log.Printf("警告: 已达到最大并发请求数限制，拒绝请求 - 客户端IP: %s", GetClientIP(r))
-			SendJSONError(w, http.StatusServiceUnavailable, "Server is busy, maximum concurrent requests reached. Please try again later.", "concurrency_limit_error", "max_concurrent_requests")
-			return
-		}
-	})
-}