feat: refactor application to use Gin framework, update routing and middleware handling

internal/http/middleware/cors.go

@@ -1,22 +1,22 @@
 package middleware
 
-import "net/http"
+import "github.com/gin-gonic/gin"
 
 // CORS 处理跨域资源共享
-func CORS(next http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+func CORS() gin.HandlerFunc {
+	return func(c *gin.Context) {
 		// 设置CORS响应头
-		w.Header().Set("Access-Control-Allow-Origin", "*")
-		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
-		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
+		c.Header("Access-Control-Allow-Origin", "*")
+		c.Header("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
+		c.Header("Access-Control-Allow-Headers", "Content-Type, Authorization")
 
 		// 如果是预检请求，直接返回200
-		if r.Method == http.MethodOptions {
-			w.WriteHeader(http.StatusOK)
+		if c.Request.Method == "OPTIONS" {
+			c.AbortWithStatus(200)
 			return
 		}
 
 		// 继续下一个处理器
-		next.ServeHTTP(w, r)
-	})
+		c.Next()
+	}
 }