ADD: added initial page with login

backend/internal/auth/middleware.go

@@ -0,0 +1,30 @@
+package auth
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+func AuthMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		authHeader := c.GetHeader("Authorization")
+		if !strings.HasPrefix(authHeader, "Bearer ") {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Missing token"})
+			return
+		}
+		tokenStr := strings.TrimPrefix(authHeader, "Bearer ")
+
+		claims, err := ParseJWT(tokenStr)
+		if err != nil {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Invalid token"})
+			return
+		}
+
+		c.Set("userId", claims.UserID)
+		c.Set("email", claims.Email)
+		c.Set("role", claims.Role)
+		c.Next()
+	}
+}