第 0 阶段：项目初始化

backend/internal/middleware/request_logger.go

@@ -0,0 +1,23 @@
+package middleware
+
+import (
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"go.uber.org/zap"
+)
+
+func RequestLogger(logger *zap.Logger) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		start := time.Now()
+		c.Next()
+
+		logger.Info("http request",
+			zap.String("method", c.Request.Method),
+			zap.String("path", c.Request.URL.Path),
+			zap.Int("status", c.Writer.Status()),
+			zap.Duration("latency", time.Since(start)),
+			zap.String("client_ip", c.ClientIP()),
+		)
+	}
+}